The Polar T31 Coded heartrate transmitter avoids interferences with other heartrate transmitters, has a long lasting battery (up to 2500 operating hours). The battery can't be replaced by the user, this needs to be done in a Polar service center. If you look for a Polar transmitter with user changeable battery check out the H1 transmitter from the related products below.
This transmitter with its coded 5kHz transmission is perfectly suited for use with out Polar Heart Rate Monitor Interface (see related products below):
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