Foldable 2.4 Ghz Wireless arc touch Optical Mouse USB Receiver for PC Laptop Connectivity: Wireless; Mouse Type: Optical Can be folded, convinent to carry Powered by: 2 x AAA battery (NOT included) Compatible with PC, Mac, windows XP, and vista and win 7 Package Included: 1 x 2.4Ghz Foldable Wireless Optical Mouse for laptop PC. 1 x USB Wireless Receiver(hiden in mouse)