BATTERIES
POLAR TRANSMITTER
The estimated average battery life of the Polar Transmitter is 2500 hours of use. Contact your distributor/dealer for a
Transmitter replacement. 
Service for detailed instructions.
Polar recycles used Transmitters.
POLAR WRIST RECEIVER
The estimated average battery life of the Polar wrist receiver is 1 year in normal use (2h/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.
Do not open the Polar wrist receiver yourself. To ensure the water resistance properties and the use of qualified components, the wrist receiver battery should be replaced only by a person authorised by Polar Electro Oy.
At the same time a full periodic check of the Polar Heart Rate Monitor will be done. Contact your distributor/dealer for a battery replacement. 
Service for detailed instructions.
Precautions
POLAR HEART RATE MONITOR
IN A WATER ENVIRONMENT
Polar Heart Rate Monitor is water resistant to 20 metres. To maintain the water resistance do not operate the buttons of the Polar wrist receiver under water. The pressure may cause the receiver to leak.
Heart rate measurement in a water environment is technically demanding for the following reasons:
•Pool water with a high chlorine content and sea water may be very conductive and therefore short circuit the ECG signal so that it cannot 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 ECG signal.
•The ECG signal strength varies depending on the individual’s tissue composition and the percentage of people who have problems in heart rate measuring is considerably higher in a water environment than in other use.
POLAR HEART RATE MONITOR
AND INTERFERENCE
ELECTROMAGNETIC INTERFERENCE
Disturbances may occur near high voltage power lines, televisions, cars, bike computers, exercise equipment or cellular phones.
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