Features:  - Bluetooth & ANT+: The device supports Bluetooth & ANT+ operation. It can be connected with your app or your bike computer, so convenient.  - Perfect For Sports: Suitable for different varieties of sports, whether it is outdoor or indoor, cycling, running, jogging, walking and so on.  - More Accurate: The principle of our product is utilized by the micro-voltage signal generated by the regular body heart beat, and amplifies the signal to directly compute out the heart rate value. Much more accurate and precise than traditional optical heart rate sensor.  - IP67 Waterproof: Waterproof design allows you to enjoy your cycling every day under different weather conditions.  - Easy To Wear: Come with adjustable chest strap, can wear the sensor in seconds.    Specification:  Color:Black;  Material:ABS;  Heart Rate Zone:30-240bmp;  Transmission Distance:Bluetooth 10m;   ANT:6m;  Waterproof Rating:IP67;  Battery Life:About 300 Hours ;  Size:Sensor: 59x35x13.5mm;  Chest Strap: 65-95cm;    Package included:  1 x Heart Rate Sensor;  1 x Chest Strap