Bornd Wireless Keyboard and Mouse Combo, Black (W521) Drain hole waterproof design Low-profile keys give you a quiet, comfortable typing experience Adjustable holder make more comfortable and convenient Oversized mouse feet, sliding no impedance Green rubber U shaped wheel glides comfortably High resolution and super accurate 1000/ 1500/ 2000DPI enables three-gear free switching and rapid movement Gold plated mini receiver 2x AAA Alkaline Batteries (Not Included)