Vktech&reg; TW64 Bluetooth Smart Wristband Watch Bracelet Sports Pedometer Can record your steps, distance and calories, which can help you set your target Sleep monitoring function, can count up your time of deep sleep and shallow sleep Smart reminder functions, such as in-call reminder, drinking reminder, wake up alarm, sedentary reminder etc. Display Size: OLED 64*32, Bluetooth Version: 4.0(Low power consumption),Material of Watchband: Soft Rubber Other Functions: Event reminder( such as water drinking, taking medicine, meeting, etc.), call reminder, message reminder, clock, sedentary reminder, vibration alarm clock, remote camera Suitable for iPhone 4S /5 / 5C / 5S / 6 / 6 Plus, IOS 6.1 and above, Android 4.3 and above, and IOS System can't support call and message reminder functions