Special Design for USB receiver Storage For notebook Easy portable Specifications: Frequency:27 MHz/2.4G Channel/ID: Single Channel,256 ID 16 Channel,16Bit IDS Transmitting Distance: Up to 1.5 M (Depends on The Working Environment) Battery: Adopt 2 AAA Alkaline Batteries (No Charger Required) Receiver: Desk Top Stylish Receiver Interface:USB;USB+PS/2 Resolution:800 CPI Mouse Buttons: 0 Buttons + 1 wheel Micro Switch:1 million cycle life Compatible with: Windows 98/ 2000/ ME/ NT/ XP