Ultra Slim 2.4Ghz Wireless USB Receiver Keyboard and Mouse Combo Set For Windows 7/8 Vista, XP, PC, Laptop (Green) Comfortably compact: Great for tight workspaces-the standard layout you're used to in a space-saving size Hassle-free design: Up to 3 years of power without battery changes plus simple setup with plug-and-play wireless receiver Plug-and-play setup with one tiny Nano USB Dongle receiver that stays in computer and lets to add compatible devices Robust connection with up to 10 meters range,the receiver inside the mouse Package Contents: 1* Wireless Keyboard(2 AAA Battery not included);1* 2.4Ghz Wireless Optical Mouse(2 AAA Battery not included) ;1* Nano-receiver(inside the mouse)