Lithium Coin Cell Battery

WIRELESS MOUSE AND KEYBOARD COMBO:Reliable 2.4GHz Wireless Connection. A tiny Logitech Nano-receiver connects both the keyboard and mouse using just one USB port
LONG BATTERY LIFE:Get up to 24 months of keyboard power and 12 months of mouse power without changing batteries
EIGHT HOT KEYS: Instantly access your movies, music, the Internet, e-mail, volume, play/pause and more
ALL-IN-ONE SETUP: Includes a full-size keyboard with quiet, low-profile keys plus a portable contoured mouse for comfortable control
SYSTEM COMPATIBILITY: :Plug and Play Simplicity for Windows PCs.Works right out of the box with Windows XP, Vista, Windows 7 and 8 – no software installation required. Illuminated Keys: Yes
IN THE BOX:Keyboard, mouse, userd documentation