POLAR COACH WRIST RECEIVER
The estimated average battery life of the Polar Coach receiver is 1 year in normal use (1h/day, 7 days a week). However, because the battery is inserted at the factory, the actual life of your first battery once in your possession may be less than the estimated battery life. Note also that excessive use of the backlight and the alarm signals will use the battery up more rapidly.
It is not recommended to open the Polar Coach wrist receiver yourself. To ensure the retention of the water resistance properties and the use of authorized components, the wrist receiver battery should be replaced only by a authorized Polar Service Center. At the same time a full periodic check of the Polar Heart Rate Monitor will be done. Contact Polar Electro Inc. 
Service for detailed instructions.
PRECAUTIONS
THE POLAR HEART RATE MONITOR IN A WATER ENVIRONMENT
Polar Heart Rate Monitors are water resistant to 20 meters. To maintain this water resistance, do not operate the buttons of the Polar wrist receiver under water.
Heart rate measurement in a water environment is technically demanding for the following reasons:
•Pool water with a high chlorine content and seawater may be very conductive and the electrodes of a transmitter may get short circuited, causing the ECG signals not to be detected by the transmitter unit.
•Jumping into the water or strenuous muscle movement during competitive swimming may cause water resistance that shifts the transmitter on the body to a location where it is not possible to pick up the ECG signal.
•ECG signal strength varies depending on an individual’s tissue composition. The percentage of people who have problems with heart rate measuring is considerably higher in a water environment than in other cases.
THE POLAR HEART RATE MONITOR AND INTERFERENCE
ELECTROMAGNETIC INTERFERENCE
Interference may occur near high voltage power lines, traffic lights, overhead lines of electric railways, electric bus lines or trams, televisions, car motors, bike computers, some motor driven exercise equipment, cellular phones or when you walk through electronic security gates.
CROSSTALK
The Polar wrist receiver in
EXERCISE EQUIPMENT
Several pieces of exercise equipment with electronic or electrical components such as LED displays, motors and electrical brakes may cause interfering stray signals. To try to tackle these problems, relocate the Polar wrist receiver as follows:
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