NTK Pemium Wireless Bluetooth Keyboard Folding Leather Case For Apple iPhone 3Gs 4 4S iTouch 4 Black New Built In Wireless Bluetooth 2.0 Plastic/Silicone Soft Touch Keyboard Built-in Lithium Lion Battery Capacity: 500 mAh Standby time: 60 Days/ Uninterrupted Working time: 40 Hours/ Fully Charged in 3~3.5 Hours Premium Leather Finish/ Customized Fit for Apple iPhone/itouch Ultra Low Profile=Easy to Carry Around Foldable Stand for iPhone/iTouch /Easily Connect to Bluetooth