Features: Brand New and high quality Optical technology for Nano/USB receiver hidden in the mouse button Can be folded, convinent to carry Folded, the mouse turn off automatically. Unfolded, the mouse turn on automatically. 2.4GHz wireless transmission up to 10 meters operating distance Powered by: 2 x AAA battery (NOT included) Elegant and ergonomic design, perfect to match your laptop or PC Easy to Install, plug USB receiver and play Compatible with PC, for Mac, for windows XP, and vista and win 7,Win 8. Pairing is necessary before using. Specification Product type: 2.4Ghz Wireless Foldable Optical Mouse For Laptop PC . Package Included 1 x 2.4Ghz Foldable Wireless Optical Mouse for laptop PC 1 x USB Wireless Receiver(hiden in mouse)