The M-XXL Polar WearLink+ Coded Transmitter is designed to track heart rate with compatible Polar devices.
- Size fits most adults
- Compatible with all Polar products utilizing 5 kHz transmission technology (F4, RS100, RS300X, RS400)
- Coded transmission eliminates cross-talk and interference when used with coded watch receivers
- Soft fabric design for improved comfort
- Built to last with up to 2500 hours of training usage
- User replaceable battery
- Original size that comes standard with Polar heart rate monitors, which use this transmitter belt style