Feature: System requirements of Android 5.0+/iOS 9.0+. Main control chip is BT8918F2, with an internal memory of 128M. Bluetooth Version 3.0/4.0 for low power consumption. 15-pin 1.9-inch full screen display, resolution of 240x296. Built-in waterproof 0715+ foaming large-magnetic speaker. 190mAH battery with Seiko pure cobalt allows standby time of approx. 18 days and 7days of usage. Mechanical encoder/switch button/waterproof circle for key activities. 0827 vibration motor for support. Wireless charging interface. SC7A20/3D-GSensor accelerometer. 12+ Local dial, 50+ dial market. 4+ menu style. QDFit Pro app. Functions: customizable dial, breathing coaching, voice calls, heart rate, SIRI assistant, blood pressure, step meter, blood oxygen, language switcher, calculator, combination lock