Lixada Wireless Bluetooth 4.0 Sport Heart Rate Monitor Ultrathin Chest Strap Band Running Fitness Exercise for Android for iPhone 6 Plus Wireless chest strap to monitor your heart rate. Adjustable elastic strap well fit for different people. Support device: Smart phone with bluetooth 4.0, suitable for iPhone 4s or above and for Android 4.4 or above. Works with many fitness and sports apps like endomondo, runtastic, nrf utility and train&run. Low-power consumption.