Material: ABS, stretch materialProduct Type: Heart Rate Monitor Chest StrapWeight: 13g (Monitor only)Unit Size: 57.6*33*11mm (Monitor only)Supported Chest Size: 64-86cm (2cm)Heart Rate Unit: bpmWireless Interface: Bluetooth 4.2, ANT+Battery Model: CR2032 x1Heart Rate Range: 30-240bpmWaterproof Level: IP67 11. [Bluetooth Support]: Supports Bluetooth 4.2, compatible with hundreds of third-party fitness apps, including compatible for beat/for Zwift/for Elite HRV/for Heart Graph/for Wahoo Fitness/for Endomondo/for Peloton, etc. 22. [ANT+ Support]: ANT+ support allows you to connect to the widest range of fitness equipment, such as compatible for Garmin sports watches, cycling computers, treadmills with ANT+, and more. 33. [Soft and Adjustable Chest Strap]: Made of comfortable, soft stretch material, the chest strap is designed to be worn all day during workouts with no friction and comfort. Fully adjustable chest strap supports bust 25" - 27". It comes with a CR2032 battery with a battery life of up to 12 months and is replaceable. 44. [Accurate and Professional]: Provide high-quality measurement for many well-trained professional athletes, the main item must be accurate is heart rate, our heart rate detector helps them get accurate heart rate. 55. [Sports Essentials]: Suitable for cycling, cycling, running, training, mountaineering, fitness, and other sports occasions.