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CW_T500_NOTICE-partie1.qxd:CW_T500_NOTICE  23/03/07  14:19  Page 1


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CW_T500_NOTICE-partie1.qxd:CW_T500_NOTICE  23/03/07  14:19  Page 1


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Congratulations on your purchase of this CW T500 heart rate monitor!

If you play a sport regularly or want to make progress in your training,

the CW T500 heart rate monitor is for you. 

The CW T500, with its automatic target zone and out of zone alarm,

simultaneous heart rate and stopwatch/countdown display, exercise

intensity display in % and training session recording function, will help you

to accurately manage your training sessions and achieve your objectives.

This product uses an exclusive dynamic heart rate measurement technique.
It adapts to the intensity of your exercise to provide the best possible
combination of measurement stability and responsiveness. 
The product’s design and comfort have also been specially tailored to suit all
body types and to make it easy to use during sporting activity.

Please read the owner's manual carefully before use. Keep this manual for
the entire life of the product.


GEONAUTE guarantees the initial purchaser of this heart rate monitor that it
will be free from defects of materials or manufacture for a period of two years
from the date of purchase. Please keep your receipt as proof of purchase.
• This guarantee does not cover damage resulting from misuse, from a 

failure to respect the precautions for use, from accidents, from improper
maintenance or from commercial use.

• This warranty does not cover damage resulting from repairs carried out by

persons not authorised by Geonaute.

• The guarantees contained herein explicitly replace all other guarantees

including the implicit guarantee of merchantability and/or suitability for use.
Geonaute cannot under any circumstances be held liable for any damage,
whether direct or indirect, general or specific, caused by or related to these
instructions for use or the products they describe.

• During the warranty period, the item will either be repaired free of charge

by an authorised repair service or replaced free of charge (depending on
the retailer).

• The warranty does not cover batteries or cracked or broken casings where

signs of a blow are evident.

• The warranty does not cover the elastic strap, which is subject to wear and



This CW T500 heart rate monitor is made up of a watch and a chest strap.
The watch is designed to be worn on the wrist or placed on its bicycle mount
during various sporting activities, in a temperate climate. It allows the user to
display various items of information and to access its functions, such as the
stopwatch, using the buttons. 
The chest strap must be positioned on the thorax. When correctly placed it
transmits heart rate data to the watch. When placed in its cradle (see
diagram), the watch displays your heart rate and various additional items of
information (target zone, exercise intensity, etc) to manage and maximise
your fitness regime or your training. 

The chest strap does not have a coded transmitter. Interchanges of
information may occur if you are close (around 1m) to other heart rate
monitor users.



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Recommendations for use :

• Handle the product with care - do not drop it or subject it to strong impacts.
• Do not dismantle the watch. This would void the warranty and could cause

damage and loss of waterproofing. 

• Do not subject the watch to extreme temperatures. If the watch is exposed

to the sun for too long, the display may darken temporarily, before returning
to normal when it has cooled down.

• Only clean the watch using a soft damp cloth. Do not use detergents, as

these may damage the watch equipment. Only the elastic part of the strap
may be machine washed (30°).

Waterproof design :

This watch is waterproof to 5 ATM. It can therefore be used in wet conditions,
in heavy rain, in the shower or when swimming. However, you must not dive
when wearing it, or swim to depths greater than 5m. Do not press the buttons
under water.
The chest strap is only “water resistant”. This means it is impermeable to
sweat and can be worn in the rain and under wet clothing, but should not be
worn in the shower or when swimming. 

Warning !

This product is designed for sports and leisure activities. It is not a medical
device. The information given by the device or in this booklet is merely for
information purposes and must only be used to monitor medical progress
after consultation with and the agreement of your doctor. 
Likewise, healthy athletes should bear in mind that determining maximum
heart rates and personal training goals are vital elements of an effective and
risk-free training programme. 
It is recommended that you seek the advice of your doctor or health
professional to set a maximum heart rhythm, your upper and lower rates,
and an exercise frequency and duration suited to your age, physical
condition and desired results.
Finally, because of possible disturbances caused by the radio transmission
system, we advise that users of pacemakers do not use a heart rate monitor
which uses this technology, such as the CW T500.
Failure to comply with these recommendations may cause a fatal risk.


Before using your CW T500 heart rate monitor, read the instructions
carefully and follow the setting procedures closely.


The chest strap uses a CR 2032 3V battery.
The watch uses a CR 2032 3V battery.

100 cm

50 cm

50 cm

50 cm




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Watch :
We recommend that you do not change the watch battery yourself. Instead
you should ask a DECATHLON specialist to change it for you.
If you change the battery yourself, you risk damaging the seal, thus impairing
the waterproof design and voiding your warranty.
Please check the availability of the battery with your retailer before you

Chest strap :
If the heart rate data becomes incoherent or the heart symbol does not flash
on the screen when the watch is placed in its cradle, it may be necessary to
change the chest strap battery. 
You can change the battery yourself, without the aid of specialist tools.
How to change the battery : 
• Unscrew the battery compartment lid using a coin and then remove it.
• Remove the old battery by tapping the other side of the strap.
• Replace the used battery with a CR2032 3V lithium battery without

touching the 2 poles (it may lose its charge). The battery should be
positioned with the + pole (printed side) facing upwards. 

• Replace the lid carefully (be careful with the waterproof join) and turn it a

quarter of a turn to the "close" position.

Should you have a problem, contact your retailer.


The “crossed-out bin” symbol indicates that this product and
the batteries it contains cannot be disposed of with household
waste. They are subject to a specific type of sorting. Deposit
the batteries and your unusable electronic product in an
authorised collection area for recycling. This treatment of your
electronic waste will protect the environment and your health.


The chest strap functions as a receiver and a transmitter. At the surface of
your skin it measures the differences in potential created by your heart beat.
It then sends this information to the watch by radio signal. Measurement
quality and accuracy depend on it being correctly positioned, as does
comfort during exercise. As the diagram below shows, the receivers are the
black rubber surfaces on both sides of the central section.

Measurement pads


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Placing procedure :
1. Moisten the pads with

water or a conductive
liquid gel to ensure good

2. Insert one of the ends of

the elastic into one of the
specially designed holes
in the strap.

3. Join the strap around

your chest and position it
just below your pectoral
muscles. Place one of
the pads below your
heart and the other
under your right pectoral

4. Adjust the length of the

strap for a firm but
comfortable hold. The
strap should not move if
you jump or move your

5. Check it is positioned correctly by holding the watch 50cm away. 

The heart symbol should flash on the display.

If it does not flash correctly:
• Reduce the distance between the strap and the watch. 
• Adjust the strap position while moistening the pads well.
• Check the batteries, especially in the strap. 

Important :

• Avoid positioning the pads on very hairy areas.
• In cold and dry climates, the strap may need several minutes to work

correctly. The pads need a layer of sweat to ensure contact with the skin. 

• When it begins taking measurements, the watch may show very high

values for around 20 seconds. This is the algorithm beginning. After this
time the display will stabilise and show correct values.

• Be careful to insert the elastic strap clip into the hole in the strap designed

for this purpose. Maintain the lock pin by passing your finger behind the


The heart rate monitor has six different modes : 

TIME mode : displays the time and date.

HRM mode : displays heart rate on the top line. Displays the exercise
stopwatch, exercise intensity in %, time in the target zone, calories
expended, and average and maximum rate on the middle line.  Displays the
heart symbol and out of target zone arrows. Displays recovery time
necessary after exercise.

DATA mode : displays data saved during each session: exercise time,
exercise intensity, time in the target zone, calories expended, average and
maximum rate, time out of the target zone and the time needed to reach
recovery rate. 

STOPWATCH mode : displays exercise time and lap time.

TIMER mode : displays the countdown and heart rate. 



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ALARM mode : displays the time set for the alarm and whether or not the
alarms are activated (ON or OFF). 

To change modes, press S2. The mode name (TIME, HRM, etc) is displayed
on the screen for two seconds before the home screen of the function


Practical information :
• When setting, the S1 button increases the value. 
• To make settings more quickly, hold down S1 to increase scrolling speed. 
• If no button is pressed for several seconds when setting, the watch

automatically exits setting mode.

1 - Time mode 

Setting the time, date and 12/24 hour mode
• In time mode, hold down S3 for 3 seconds.
• The hours flash.  Set the time chosen using S1.
• Confirm your setting by pressing S2. The minutes flash. 
• Set the minutes using S1. Keep pressing S2 to set the seconds, year, month,

date and the 12/24 hour display mode. The day of the week is set automatically. 

• Press S3 to exit setting.
Sounds setting
In time mode, press S1 to activate/deactivate the hourly beep (beep at the
top of the hour). 

2 - Heart mode (HRM)

Displaying the heart rate monitor (HRM)
In HRM mode, the top line displays heart rate in beats per minute (bpm). The
heart symbol is displayed at the bottom of the screen. The heart flashes
when the watch receives a signal sent by the chest strap. 















S1 : hourly beep
S2 : mode  
S3 : setting/return to zero
S4 : electroluminescence

S1 : hourly beep
S2 : mode  
S3 : setting/return to zero
S4 : electroluminescence














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The middle line displays four different items of information : 
• total time elapsed since the beginning of the exercise session.
• time in the target zone since the beginning of the exercise session.
• average heart rate
• maximum heart rate
Press S3 to go from one display to the next.

The  CW T500 heart rate monitor offers two different modes for the target
zone : 
- manual target zone enabling direct entry of upper and lower limits in bpm
- automatic target zone enabling calculation of upper and lower limits

according to the exercise intensity chosen. 

Setting the HRM mode
Go to HRM mode by pressing S2. To go to setting mode hold down S3 for
three seconds. 
NB : After each operation, move on to the next setting by pressing S2. 

Set your gender with S1 : Choose “MALE” or “FEMALE”. Move on to the next
setting by pressing S2. Set your age with S1. Go to the next setting. 
Now select your weight measurement unit (“kg” or “lb”). Go to the next
setting. Now set your weight by pressing S1. Go to the next setting.
Now select your height measurement unit (“cm” or -‘—‘’ for feet). Go to the
next setting. Now set your height by pressing S1. Go to the next setting. Now
set your level of activity by pressing S1 : “0” = occasional activity, “1” =
regular activity, “2” = intensive activity. This information is used as a
corrective coefficient in calculating calories expended. Go to the next setting.
Now select target zone mode :  “auto” to automatically calculate target zone
limits according to desired exercise intensity, or “manu” to manually enter
upper and lower target zone limits. Go to the next setting.

If you have selected manual mode (“manu”), you now set the lower limit.
“SET LO” is displayed. Set the value you have chosen using S1. 
Now access upper limit settings by pressing S2. “SET HI” is displayed. Set
the value you have chosen with S1.

If you have selected automatic mode (“auto”), you can now set your resting
heart rate

This should be measured when you get up in the morning, before

any physical exercise. Set the value with S1. The default value is 50 beats
per minute but you can set a value as low as 30 beats per minute. Go to the
next setting.
Now set your maximum heart rate. The default value displayed is the result
of a theoretical calculation based on your age and gender. If you wish, you
can modify this value with S1. To accurately calculate your maximum heart
rate, we recommend that you undertake an exercise test with your doctor.
Go to the next setting.
Next set the lower target zone limit, shown in %. “Min In” is displayed. Set
the desired value with S1 and then go to upper limit setting (“Max In”) with
S2. Set the desired value with S1. 

Having set the limits for the target zone, press S2 to activate the out of zone
alarm. Select “ON” or “OFF” with S1.

Confirm and exit setting mode by pressing S3.

Using the HRM mode.
When the watch is searching for the signal transmitted by the strap, “---” is
displayed on the top line. When the heart signal is detected, the heart
reception symbol flashes and the heart rate is displayed after several
seconds. Ignore the first value shown. The watch needs around twenty
seconds to make calculations and read data in order to display a stable,
reliable figure. 
If you have already set a target exercise zone, the watch displays alongside

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the heart symbol :
• either an up arrow to indicate that you are currently above the target zone
• or a down arrow to indicate that you have not yet reached the target zone. 
If you have activated the out of zone alarm, a beep warns you when you are
not in the target zone. 
Press S3 to select the desired display mode on the middle line. To be able
to start the stopwatch, you must first display it.

Press S1 to start the exercise stopwatch. The stopwatch symbol flashes at
the bottom of the screen. The time in the zone and average and maximum
heart rate calculations are activated.
During or after exercise, you can display the time elapsed, the time in the
zone, and average and maximum heart rates by pressing S3. 
To stop the exercise stopwatch, press S1 again. 

To reset the stopwatch to zero and save the data to memory, hold down S3
for three seconds. “SAVE” is displayed on the top line. Press S1 and select
"YES" to save the data to memory or "NO" to delete it immediately.  Confirm
by pressing S3. If you select “YES”, the data is saved. The HRM mode is
reset to zero.

3 - Memory mode (DATA)

Select DATA mode by pressing S2. 

DATA mode display
The bottom line displays the file number (marked DATA). If the file is empty,
“no data” is displayed. 
The middle line indicates the various settings displayed (exercise time,
exercise intensity, time in the target zone, calories expended, average and
maximum heart rates, time out of the target zone and time needed to reach
recovery rate. 
The top line indicates the value of each of these settings.

Using DATA mode
Select  DATA mode with S2. The device automatically displays the file
To delete the content of the file, hold down S3 for three seconds. “ERASE”
is displayed on the middle line. Confirm by pressing S3. 


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4 - Stopwatch mode (CHRONO)

Select the stopwatch by pressing the S2 mode button.

Stopwatch display.
The top line displays the total exercise time.
The middle line shows the lap time.

Using the stopwatch
Press  S1 to start the stopwatch. The two lines simultaneously display the
exercise time. The stopwatch symbol flashes at the bottom of the screen.
To record a lap time, press S3. The total time since the beginning of the
exercise is displayed on the top line for five seconds. The lap time is
displayed on the middle line. 
After this time, the stopwatch returns to normal display mode. The total time
since the beginning of the exercise scrolls on the top line and the time since
the previous “LAP” scrolls on the middle line. 
Press S1 to stop the stopwatch. The stopwatch symbol disappears. 
To reset the stopwatch to zero, hold down S3 for three seconds. The two
lines flash and the display then returns to zero. 

5 -  Countdown mode (TIMER)

Select the countdown timer by pressing S2. 

Countdown display
The top line displays the countdown beginning at the preset value.
The middle line shows your heart rate.
The bottom line displays TIMER.

Setting the countdown timer
Hold down S3 for four seconds to set the countdown value.  The seconds
flash. Set the seconds value with S1. Set the minutes and hours by pressing
S2. Having set the countdown value, select “repeat on” for a repetitive
countdown or “repeat off” for a one-off countdown. 
Confirm and exit setting mode by pressing S3.

Using the countdown
Press S1 to start the countdown. The time will count down from the preset
value. When the countdown reaches zero, an alarm sounds. The device then
stops at 0 if you have selected “REPEAT OFF" or repeats the countdown if

S1 : start stopwatch  
S2 : mode 
S3 : Lap times/reset to zero 
S4 : electroluminescence

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you have selected "REPEAT ON”. 
Press S1 to stop the countdown and hold down S3 for two seconds to reset
the countdown to zero.

6 - Alarm mode (ALARM)

Setting the alarm mode
Go to ALM mode by pressing S2. Hold down S3 to set the hour. 
Set the chosen value using S1. Confirm your setting with S2. 
Set the minutes with S1. Confirm and exit setting mode by pressing S3. 
The alarm is automatically activated. “ON” and the symbol .)) are displayed.

Activate/deactivate the alarm
Press S1 to activate the alarm. “ON” and the alarm symbol are displayed on
the screen. The alarm symbol will also be displayed in time mode. 
Press S1 to deactivate the alarm. “OFF” is displayed and the alarm symbol

Using the alarm
The alarm sounds at the preset time. 
To turn the alarm off when it sounds, press any button.


• Watch waterproof to : 5ATM
• Strap waterproof to : 1ATM (not suitable for swimming)
• Temperature : From –10°C (14°F) to 50°C(122°F)
• Radio transmission : Amplitude modulation on a carrier wave (5kHz)
• Stopwatch from 0 to 99hr 59min 59.99sec: resolution 1/100 s
• Exercise stopwatch from 0 to 99hr 59mins 59.99sec: resolution 1/100 s

Batteries :
- Watch : CR 2032 (do not change yourself)
- Strap : CR 2032
- Approximate battery life in normal use (5hrs per week in HRM mode): 
1.5 years for the watch and around 1 year for the strap.

Important : The backlighting function uses a lot of power (2000 times more

than the watch when functioning normally). If you use this function
frequently, the batteries’ life may be significantly reduced. 
After several hours of use you will need to change them. 

S1 : activate the alarm  
S2 : alarm mode
S3 : confirm and exit setting mode 
S4 : electroluminescence 


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If you cannot find the solution to your problem in this problem-solving table,
please contact your DECATHLON after-sales service. 



1 – No heart rate displayed. 

1.1 – Insufficient moistening of electrodes. 

1.2 – Strap not positioned correctly. 

1.3 – Strap battery low or not functioning. 

2 – Faint or unreadable watch


2.1 – HRM watch battery is low. 

3 – The rate displayed is

erratic or much too high..

3.1 – The device is suffering from interference. 

3.2 – You are detecting the heart rate of

another runner.

3.3 – Strap is rubbing

3.4 - Poor conduction in dry and cold weather. 

4 – The rate displayed at the

beginning of exercise is

4.1 – The algorithm is beginning. 

5 – The product does not

function correctly. 

5.1 – The buttons do not activate the correct

functions, or the device seems to be
functioning abnormally. 

6 – When using the HRM

function, the device beeps. 

6.1 – The target zone alarm is set wrongly. 

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Moisten the electrodes with water or a liquid conductive gel. 

Check that the strap is positioned correctly around your rib cage, as in the
diagram featured in these instructions. 

After checking the two points above, bring the HRM watch close to the strap you are
wearing to check that transmission is re-established. If necessary, change the strap
battery as indicated in the instructions. 

To change the HRM watch battery, consult a DECATHLON specialist. 

You may be in an area with a strong magnetic field, a power line, a catenary
system, radio communication equipment, etc. In this event, move away from the

The strap does not have a coded transmitter. The strap does not have a coded

Check that the strap is fastened correctly and that the electrodes are well
moistened. If the strap rubs it will send a signal which does not match your heart

When the weather is dry and cold the product may send out erroneous
information for a few minutes. This is normal because a layer of sweat is needed
to provide good contact between the skin and the electrodes. 

For several dozen seconds the value displayed may not match your actual heart
rhythm. This is due to the beginning of the algorithm. 

Activate the RESET function by holding down S1, S2, S3 and S4 simultaneously
for two seconds. Then follow the setting procedure described in the instructions. 

The target zone alarm is probably activated, and you are out of the zone. Refer
to the instructions for how to set the zone or deactivate the target zone alarm. 

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For best results and to protect your safety, it is essential that you are aware
of various physiological factors linked to training. 
The advice we provide below is aimed at healthy, sporty people without any
medical difficulties.  
We strongly advise you to seek the advice of your doctor to design more
accurate training zones. 

Important :

Know your limits and do not exceed them !

To maximise the benefits of your physical training, you should first find your
maximum heart rate (MHR) in beats per minute (bpm). 
Your MHR can be estimated in the following way: 
MHR = 220 - your age

During a fitness programme, several training zones will give specific results
corresponding to different objectives. 
Depending on exercise intensity, the proportion of energy coming from the
combustion of sugars and fats changes. 

E.g. : A 30-year-old athlete doing aerobic endurance training to increase her
resistance to exercise and improve her 10,000m time. 
The most effective training zone for her objective would be between 80 and
90% of her maximum heart rate. 


This product conforms to section 15 of the FCC rules. 
It functions according to the following two conditions: 
1. This device will not produce harmful interference. 
2. This device must accept any interference received, including interference
that may cause undesired operations. 

This equipment generates, uses and emits radio frequency energy and, if it
is not installed in accordance with the instructions, may cause interference
which is harmful to radio communication. 
However, there is no guarantee that it will not produce interference in a
particular environment. 
If this equipment causes interference which is harmful to radio or television
reception, bearing in mind that interference can be controlled by turning the
device off and then on again, the user is advised to guard against this




50% - 60%

60% - 70%

70% - 80%

80% - 90%

Moderate activity (walking, hiking, etc)

Weight control (cardio training, running, inline skating)

Aerobic zone (endurance training, 10km)

Speed training (400m)

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interference by taking one or more of the following measures: 
- Reorienting or moving the reception aerial. 
- Increasing the distance between the device and the receiver. 
- Plugging the device into a socket on a different circuit to that on which the

receiver is plugged in. 

- Seeking the advice of the retailer or a technician specialising in


Important :

Any change or modification not explicitly approved by

Décathlon may void the authorisation given to the user to use the equipment. 


This device has a factory diagnostic mode: 
- To launch factory mode, hold down all the buttons at the same time for two


- To begin factory mode, hold down the MODE button for two seconds when

the system reboots. 

• The system automatically launches the following sequence : The model

number is displayed on the first line and the version on the second line. 

• Press  MODE to check that digits 0-9 are displayed on the two lines.

The screen then displays the model and version numbers again. 

• Press SET at any time to leave factory mode and return to the time display.


So that we continue to develop improved products which meet your needs,
we are pleased to hear your feedback with regard to the quality, functionality
and usage of our products.

- In France, you can contact the customer relations centre on : 0810 080808

(price of a local call).

- In other countries, you can leave a message on the appropriate section of

our website at www.decathlon.com

We will reply as soon as possible.


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