Polar T31 Coded Transmitter,Black,M

Transmits heart rate data to Polar heart rate monitors using 5kHz transmission and compatible gym equipment, compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5 Compatible products: Elastic straps, individually coded to pick up your heart rate monitor and not others nearby, this eliminates cross-talk with other electronic devices in the same area Slim, lightweight, and waterproof design Fits 25 to 54 inch chest size Average battery lifetime is 2500 hours of use, non user replaceable battery