DFyou Bluetooth Waterproof Heart Rate Smart Watch Wrist Band for Android Apple Smartphones (DFit-White) Turn on the Wristband: Touch buttons are hidden in the time following. Long press the touch key 4 seconds to turn on the wristband IP66 Waterproof sweatproof bluetooth wristband: It is a new Bluetooth Smart bracelet which is compatible with all Bluetooth V3.0 or above enabled smartphones,such as iPhone 4S, 5, 5S, 6, 6S Plus, Sumsung S3, S4, Note 2, Note 3, Note 4 etc. Heart Rate Monitor: Measure your heart rate any time, the same sensor with Iwatch Pedometer: Display the real time step count, record your daily exercise Function: Palming bright screen, date graph, sync wristband date, incoming calls, sedentary reminder