EH0311B Features Compatible with Windows， Linux， Android and Symbian operating systems Bluetooth wireless handhold keyboard with a Qwerty design Up to 10m operating range Backlit function Built-in rechargeable lithium battery General Specs Brand & Model RT-MWK518BT Rii  Operating Current <35mA Operating Voltage 3.3V Operating Range Up to 10 m Recharging Current <300mA Recharging Voltage 4.2V-5.5V Sleep Current <1mA Battery Type Built-in lithium-lion battery Dimensions 108.5 x 58.2 x 10.2 mm Weight 75 g Working Temperature Ranges -10°C-55°C System Requirement Windows/Linux/Android/Symbian Package Details Weight: 193.67 g Size: 13.00*13.00*3.00 cm Package Includes * RT-MWK518BT Rii Multifunctional Mini Bluetooth Qwerty Keyboard with LED Backlight