This hear rate sensor provides real-time heart rate to compatible mobile training apps, via low energy Bluetooth Smart technology. Includes a soft fabric chest strap that seamlessly adapts to your body shape. User replaceable battery. 

Features:
HEART RATE MONITOR: Provides live, accurate heart rate to compatible mobile training Apps through Bluetooth Smart technology.
FITNESS TRACKER: Waterproof heart rate sensor compatible with almost all devices that support Bluetooth 4.0 or newer / for Andriod 4.3 or newer / or for iPhone 4S or newer.
STRONG BATTERY LIFE: 800-hour battery life, detach transmitter from chest strap after every use.
CALORIE COUNTER CAPABILITIES: For those who want to count the calories they burn and get basic heart rate-based features to keep their fitness training simple.
COMPATIBLE APPS: Strava, Runkeeper, Wahoo, Digifit, ALA Coach+, ibik, Endomondo, Runtastic pro, Sports tracker, Rungps, Wahoo fitness, Nike Running.

Specification:
Sense distance: 50M
Waterproof Grade: IPX7
Battery Life: 800H
Transmission Technology: Bluetooth 4.0
Battery Size: Replaceable CR2032 (Included)
Sensor material: ABS
Color: Black
Sensor Size: 66 * 38 * 11.7mm / 26 * 15 * 4.6in
Sensor Weight: 20g / 0.7oz
Strap material: Medical-level acidulous Polyester
Strap Weight: 39g / 1.38oz 
Strap Size: 100 * 2.9cm / 39.37 * 1.14oz

Package List:
1 * Sensor with Strap