iClever Bluetooth Slim(4mm) Aluminum Keyboard for iOS (iPad Pro, Air 2 / Air, iPad mini 3 / mini 2 / mini, iPad 4 / 3 / 2), Windows (Surface) and Android 3.0 and above OS with Built-in lithium Battery Aluminum alloy bottom cover with 4 anti-slip pads Features Bluetooth 3.0 for superb wireless performance Built-in, rechargeable Li-polymer battery User-friendly QWERTY keypad with quiet keystrokes Supplied flannel carry pouch adds protection while transporting the keyboard