Connection Type: Wireless, Layout: Eng, 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), Tiny USB receiver with Logitech Unifying Technology, On/off power switch, Caps lock indicator light, Battery indicator light, 18-month mouse battery life, Contoured shape with soft rubber grips,Full-s ze and ambidextrous, Advanced optical tracking, 3 buttons, scroll wheel, On/off power switch