POLAR VERITY SENSE optical sensor (Size: M-XXL)

Polar Verity Sense - optical heart rate monitor with internal memory. Works with Bluetooth and ANT+.

This heart rate sensor is placed on the arm (forearm or biceps) or on the strap of swimming goggles.
Rechargeable battery that lasts up to 20 hours.

The sensor can record training itself - internal memory up to 600 hours. training with HR.
HR information is sent via Bluetooth Smart connection to your Polar monitor or smartphone (Polar Beat or third-party apps are suitable).
Can record distance and speed in the pool.
Extremely light and small (the sensor weighs only 5 grams, and the elastic band - about 12 grams).
Water resistance up to 50 m.
Signal transmission frequency to another device: up to 150 meters.