Heart Rate Monitor Fitness Tracker, Vcall C6 Waterproof Bluetooth Activity Tracker Smart Bracelet Band Wristband With OLED Display Sports Pedometer Health Sleep Monitor for iOS Android The best wearing spot is 2cm above anklebone where you can get most reliable steps and heart beats data.Long press the small dot on the screen till the heart icon changes circularly from big to small to activate its heart rate monitor. A green detecting sensor light can be seen on the back of the body Steps taken at the very beginning will not be displayed till your steps are getting steady.Count your steps when climbing, show the calories burned when you are having an intense basketball competition. Remote Photo Taken, Sedentary Reminder, Sleep Monitor etc. A must have for your daily exercises Work under the extreme environmental condition. Do not want to take it off when washing hands or taking a shower? Now your worries are all gone thanks to its IP56 leveled waterproof technology Disassemble the body from its band to charge the device with the provided charging cable. Get social app notifications such as facebook, wechat etc and share your daily sports data to your iPhone built-in Health application For those Android 4.4 or iOS 7.0 based or a higher operating system powered & Bluetooth 4.0 supported smart phones. Such as iPhone 4S/5/6 (Not for iPhone 4).