Henxlco Bluetooth 3.0 Wireless Keyboard For iPad Pro, Ipad Air 2 / 1, iPad Mini 4 / 3 / 2 / 1, iPad 2 3rd 4th, Mac Computer PC Macbook, iPhones and Other Apple Devices with IOS Operating System Bluetooth Version: Bluetooth V3.0; Transmit range: 10M Power By 2pcs AAA battery (Not included) Keyboard Size: 285mm*120mm*18mm; Frequency: 2.4GHz; Working Current: 10mA; Standby Current: 0.5-0.6mA Shutdown Static Current: 0mA; Low Voltage Electrical Testing: 3.3V Notice: 1. Please notice the place of anode and cathode when put in the batteries. And use new battery to test. 2. Turn on the power.Then click the Bluetooth button in the edge of the keyboard. Please press the black button on the back of the keyboard (such as picture shown) for about 5-10 seconds, it's very important.