Item name:Heart Rate Sensor Unit size :57.6*33*11mm Wireless connection : Bluetooth /ANT+ Chest strap size : 64-86cm (±2cm) Battery model : CR2032*1 Water proof level : IP67 Anti-splash Heart rate unit : bpm Heart rate range :30-240bpm Heart rate accuracy : ±1bpm Weight Sensor : 13g; Chest strap: 30±1g Battery life : 1000 h Content in box : Sensor*1, Chest Strap*1, CR2032 battery* 1 (installed) Compatibility -Compatible with various types of Bluetooth wristwatches, GPS Bike Computers, Smartphone APPs supporting standard heart rate protocols -Compatible with all kinds of ANT+ GPS Bike Computer and Sport Watches Buy from Us! 100% POSITIVE FEEDBACK 100% Warranty & After Sale Service 100% PARCEL ARRIVAL GUARANTEED 100% x hidden charges 7 days size exchange 7 days 100% Guarantee back Prompt response Registered SSM company- Icebikeheaven 10 Years of experience