ebada(TM)Bluetooth Keyboard Case(Multi-Color to Choose From) for iPad Mini Compatibility: designed for new ipad mini. Working distance: 10 meters Built-in Lithium polymer battery capacity: 450mah. Voltage:3.7V Power charge connector. Input: Mico USB charge 5v Keyboard dimension: 20.4cmW x 15.0cmD x 2.1cmH. Keyboard weight: 352g. Standby time: 30days apptox. Continual working time: 60H Charging time :2.5-3hrs.