Wireless Keyboard K270 delivers reliable wireless wherever you use your keyboard. The tiny Logitech Unifying receiver stays in your laptop and lets you add devices. You can easily add another compatible mouse or keyboard without using multiple USB receivers. With Logitech Advanced 2.4 GHz wireless connectivity, enjoy virtually no signal loss from up to 10 meters away. Full-size layout includes number pad; a wide, curved space bar and eight hot keys for instant access to music, email and more. Durable keys feature a special UV-coating to protect the keys from fading. Spill-resistant keyboard offers easy plug-and-play setup. Simply plug the wireless receiver into a USB port on your computer and start using your keyboard right away without software. Battery life lasts up to 24 months with auto standby to help you save energy. Wireless keyboard includes two AAA batteries and is compatible with Windows XP, Vista and Windows 7.