MK540 Wireless Combo, 2.4 GHz Frequency/30 ft Wireless Range, Black. Connect your keyboard and mouse with one tiny Logitech® Unifying USB receiver. You'll get a reliable, encrypted and wireless connection up to 30 ft away with virtually no delays or dropouts. The keys have been optimized for improved accuracy and reduced noise. The palm rest and adjustable tilt legs keep you comfortable for long stretches at the desk. The wireless mouse's contoured shape and soft rubber side grips are designed to fit comfortably in either your right or left palm. Enhanced tracking and precise cursor control keep you in command. Convenient and essential hot keys give you direct access to media, calculator and battery check functions. Preset function keys can even be personalized in Options to meet your specific needs. Your keyboard won't require new batteries for 36 months and your mouse stays powered for 18 months. The keyboard is spill resistant to 60 ml of liquid and abrasion resistant key printing ensures your keys won't quickly fade.