Logitech Wireless Combo MK270. The reliable wireless combo with a tiny Logitech plug-and-forget receiver. You get a reliable connection up to 10 meters away, with virtually no delays or dropouts-even in the busiest wireless environments-thanks to Logitech Advanced 2.4 GHz wireless connectivity.* And 128-bit AES keyboard encryption helps keep your information secure.<br><br>* Wireless range may vary due to environmental and computing conditions.<br> 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 24-month keyboard and 12-month mouse battery life-plus auto-sleep and on/off switches-mean you can explore QQ, shop Taobao and search Baidu for months without the hassle of changing batteries.**<br><br>** 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.