With comfortable fabric strap, and it's slim, light and ergonomically in design. 

Battery lifetime is 1200 hours. 

HR40 supports Bluetooth/ ANT+ connection with iGPSPORT bike computers or smart phones to sync in

real time heart rate data with iGPSPORT cloud platform for analyzing training data.

Strap length: 65-95cm

Wwight: 47g

Waterproof: IPX7

Sensor device: ECG