Logitech MK235 Wireless Keyboard and Mouse Combo – Black – Connection Type: Logitech non-unifying protocol (2.4 GHz) with Nano USB receiver – Wireless Range: 10 meters – Keyboard: Low-profile keys, Adjustable keyboard height – Battery: 2 x AAA – Mouse Sensor technology: Advanced optical tracking – 920-007937 – 12 Months Limited Warranty