specification: Item Type: Heart Rate Monitor Chest Strap_x000D_Material: ABS_x000D_Efficacy: Reflect the body condition quickly and clearly during exercise, avoid excessive exercise to the body damage. At the same time, knowing your heart rate can help you keep your exercise strength at an appropriate level for better health._x000D_Battery Type: 1 x CR2032 Button Battery (Not Included)_x000D_Uses: Runs, bikes, yoga, etc. Features: 1Fitness Data Analyze: Heart rate sensor can accurately monitor your training heart rate and calorie expenditure in real time, which can effective analyze your fitness data and achieve your goals. 2Comfortable Wear: Heart rate monitor chest strap can be fully adjusted o provide a good fitness experience, which is comfortable to wear, and will not slide when moving. 3Easy Connect: Heart rate sensor chest strap combines Bluetooth and ANT+ technology, which allow you can connect using 2 functions at the same time. 4Compact Size: Waterproof chest heart rate sensor is small in size and light in weight, easy to carry, which allow you can comfortably wearing while working out. 5Widely Use: Heart rate sensor is made of high quality ABS material, adopted IP67 waterproof design, which is suitable for running, cycling, yoga, etc., but not for swimming. PackageList: 1 x Heart Rate Sensor 1 x Elastic Band 1 x English Instruction