Koolertron 2.4GHz Portable Cool Red Wireless Keyboard and Mouse Combo Set (Red) 2.4GHz portable nano receiver (the USB receiver is in the mouse where puts battery), plug and play, do not need to install. The mouse with DPI governor, adjustable speed: 1600/1000/600. Laser Engraved Key Cap, multi-media Keyboard controls. Keyboard size: 44*13.5*0.5cm. Mouse size: 11*7*3cm. Lite version interface design, can perfect match your workspace. Package contents: 2.4G Wireless Keyboard, 2.4G Wireless Mouse, USB nano receiver (pre-installed on the underside of the mouse). Laser Engraved Key Cap, multi-media Keyboard controls.Key press life: More than 10 million times.