Ultra Thin Bluetooth 3.0 Wireless Aluminum Keyboard Case Cover for Samsung Galaxy Tab S 10.5 SM-T800(Black) Modern style designed for Samsung Galaxy Tab S 10.5 SM-T800 Built-in Wireless Bluetooth 3.0 Rechargeable Keyboard Energy saving keyboard sleep mode Light weight, quiet keystrokes Built-in rechargeable lithium battery that lasts for approximately 55 hours per charge