Logitech Wireless Combo MK270. The reliable wireless combo with a tiny Logitech plug-and-forget receiver.Logitech Advanced 2.4 GHz wireless delivers the reliability of a cord plus wireless convenience for up to 10 meters, with virtually no delays or dropouts—even in the busiest wireless environments.* The Logitech receiver is so tiny, you can plug it in once and forget about it. Plus, the mouse features a built-in storage compartment, so you can take your mouse wherever you use your computer. A 36-month keyboard and 12-month mouse battery life—with auto-sleep and on\/off switch—lets you go years without the hassle of changing batteries.** And the simple software-free setup will have you on QQ, Taobao, and Baidu in no time.* Wireless range may vary due to environmental and computing conditions.** Keyboard battery life calculation based on an estimated two million keystrokes\/year in an office environment. User experience may vary. Mouse battery life may vary based on user and computing conditions.