Features: 22 Numeric Keypad with mute mouse kit make working in excel and constantly on the go for work or school be exceedingly effortless. 2.4G wireless transmission signal stable anti-interference,the digital keyboard and mouse share one receiver. After 3 mins without use the Keypad will enter into power-saving mode-. With LED red light: the red light is always- On under NUM-LOCK; After sleep, the red light goes outLow-voltage indication: flashing in the working state of the red light indicates low-voltage Plug-play functionality no drivers- or pairing procedure is required. Simply insert the provided 2.4GHz USB receiver adapter from the back of the Numpad and slide the ON/OFF switch to any computer/laptop, gaming console with USB port. Specifications: Wireless protocol: 2.4Ghz Working distance: about 10meters without obstacles Battery type: 2xAAA battery (Not included) Working voltage: DC1.5V Working current:less than 5mA Continuous working time: 250H (1000mAh battery calculation) Standby time: 120days Sleep current: about 50uA In the sleep state, the keyboard enters into sleep 3 minutes after no action; Note: Due to the different monitor- and light effect,the actual color maybe a slight different from the picture color. Please allow 2-3cm differs due to manual measurement . Package includes: 1Setx 2.4G Wireless Numeric Keypad Mouse 1PCx USB Rceiver 1PCx User Manual