Product Description Material: ABS Sensor size: 59 * 35 * 13.5 mm Adjustable size of chest strap: 6595 cm Heart rate interval: 30240 bmp Waterproof level: IP67 Transmission technology: Bluetooth, ANT+ Battery liJK-FE: 300 hours Colour: Black Quantity: 1 pcs Package content: 1 pcs * Heart rate belt 1.COMPATIBLE DEVICES:Support Bluetooth and ANT+. You can wear the heart rate sensor while cycling and pair it with your bike computer.It can also connect it to your sport watch, cycling platform and sports APP. 2.MULTI-SCENE APPLICATION: The heart rate monitor chest strap helps you track and capture real time and accurate heart rate to maximize your workouts when rowing, cycling, running, training indoors. 3.COMFORTABLE TO WEAR: This chest strap is made of skin-friendly materials, which is more comfortable to wear and does not slip when moving. The fully adjustable chest strap can be 65cm to 95 cm. Provide you with a great fitness experience. 4.LONG BATTERY LIJK-FE: The battery lasts up to 300 hours, with user-replaceable CR2032 battery. 5.TIPS FOR USING:Moisten the plastic electrode areas of the chest strap before use ,Wear it on your body before pairing it with your device,Connect the device in App, not in phone setting.