The full-size keyboard features a familiar key shape, size, and feeling – and the contoured and ambidextrous mouse has been designed to fit comfortably into either palm. The palm rest and adjustable tilt legs keep you comfortable for long stretches at the desk. Convenient and essential hot keys give you direct access to media, calculator and battery check functions. Spill resistant design. Abrasion resistant key print. The wireless mouse’s contoured shape and soft rubber side grips are designed to fit comfortably in either your right or left palm – and enhanced tracking and precise cursor control keep you in command. 3 buttons, scroll wheel. Windows, Chrome OS. 3 x AA alkaline batteries (pre-installed). 1 combo set. Black.