Logitech Wireless Combo MK220

“Keyboard: 10-Key Number pad Music Controls Up to 5 million keystrokes (excludes number lock key) Key type: Deep-profile Spill-resistant 6Tested under limited conditions (maximum of 60 ml liquid spillage). Do not immerse the keyboard in liquid. 2 AAA batteries (Alkaline Batteries) Mouse: Sensor technology: Smooth Optical Tracking Number of buttons: 3 (Left/Right-click, Middle click) Scrolling: line-by-line Scroll Wheel: Yes, optical 2 AA batteries (Alkaline batteries) Sustainability: Mouse plastics: 66% post-consumer recycled material Keyboard plastics: 44% post-consumer recycled material Receiver plastics: 75% post-consumer recycled material”