Other | MK540 ADVANCED: Wireless Keyboard K540: 2 x AA alkaline batteries (pre-installed); Wireless Mouse M310: 1 x AA alkaline battery (pre-installed); Keyboard: 36-month keyboard battery life; Familiar key shape and feel, whisper-quiet; 3 tilt positions (natural, 4°, and 8°); Spill resistant design; Abrasion resistant key print; Advanced 2.4GHz wireless (10 meters); Wireless encryption; Tiny USB receiver with Logitech Unifying™ Technology; On/off power switch; Caps lock indicator light; Battery indicator ligh Mouse: 18-month mouse battery life; Contoured shape with soft rubber grips; Full-size and ambidextrous; Advanced optical tracking; 3 buttons, scroll wheel; On/off power switch |