Rapoo T6 Black Touch Scroll USB RF Wireless Optical 1000 dpi Mouse Maximum dpi: 1000 dpi Power Supply: 1 x AA Battery Operating Time: Up to 3-month Distance: 33 feet Operating System Supported: Windows XP, Windows Vista, Windows 7 System Requirement: USB port Version: RF Wireless Package Contents: T6 Wireless Mouse White USB Nano Receiver Quick start guide 1x AA alkaline battery (pre-installed)