Functionality: 【Rechargeable 2.4GHz Wireless Connection】 Easily charged, no need to change the battery. The mouse and numeric keypad share a USB receiver and charging cable. Do not occupy other USB ports. 【Comfortable to Type】Advanced scissor switch construction keys provide silent touch response. A quick bounce and 19mm key gap allow for smooth and fast data entry without missing a key. 【Portable Design Easy to Use】Using 2.4GHz wireless technology, plug and play, no device driver, signal transmission stability, almost no delay, working range up to 32.8 feet. Ultra-thin and wireless features give you a great option to travel anywhere with a numeric keypad for your laptop. Specification: Item type: Numeric keypad Material: ABS Colour: black. Battery: Mouse: AAA x 2 (battery not included), Keyboard: AAA x 1 (battery not included) Wireless transmission frequency: 2.4GHz Interface: USB Keyboard keys: 18 keys Number of keys: 4 keys Operating distance: approx. 10m/10.93yd Optical resolution: 1200 dpi Purpose: Lightweight, portable, can be used for laptops, accounting, banking, securities, etc., with its own receiver, intelligent energy saving. Package List: 1 Keyboard 1 Mouse 1 Receiver