APP : Hiwatch ultra Compatible Systems : Android 5.0 abovelOS9.0 Screen size : 2.3 - inch HD bezel - less fully lamina large screen Resolution : 320 * 385 resolution Button : Double key Screen : HD full touch screen Connect : BT 3.0 / 4.0 / 5.0 / 5.1 Sensors : G - Sensor SC7A20 Battery Type : Polymer lithium batteries Battery Capacity : 3.7V / 200mAh Charging mode : Wireless charging Bracelet Size : 49MM Real snap Color : Black , Pink , white