EH0315B Features 2.4GHz wireless technology QWERTY mini keyboard 90 degree rotation touchpad design with adjustable DPI 27 super bright LED backlight Creative navigation keys and mouse wheel function Automatically sleep and wake up functions Built-in rechargeable lithium battery Great for meetings， presentations， lectures use Compact size for ease of carrying General Specs Brand & Model Rii MWK03   Wireless Technology 2.4GHz RF Wireless Model DSSS RF Operating Range Up to 10 m/30 feet Buttons 79 buttons LED Indicator 27 LED backlight Output Power Max. 4dB Working Voltage 3.3V  Working Current <150mA Charging Current <350mA Sleep Current <1mA Package Details Weight: 245.03 g Size: 18.5*9.00*4.00 cm Package Includes * Rii MWK03 2.4GHz Mini Wireless Keyboard * USB Cable * Receiver