This Heart Rate Monitor has integrated 5.3K transmission technology. Data can be transmitted to 5.3 KHz compatible bracelets, watches or treadmills. It is perfect for fitness tracking as well as people who have health problems. The device is made of high quality material and is waterproof. Specifications: - Function: Heart rate monitoring / HRV function - Data transmission: 5,3KHz - Wireless transmission distance: 80~100cm - Transmitter size: 66x38x14mm - Transmitter color: Black - Material: ABS - Battery type: CR2032 - Battery life: 10 months - Strap length: 65-95cm - Strap color: Black - Waterproof level: IP67 - Capabilities: 5.3 KHz bracelet, watch, treadmill, POLAR FT7, Garmin etc.