Nano 2.4GHz wireless mouse color: yellow , blue , red, green, black Functions: 2.4GHz free moving in 10 meters 16 automatically switchable working frequencey and over 50 000 groups of secure encoding to free external interfere Nano super Mini receiver, Plug and play Buit in storage medium, no need re-code after you replace battery. Resolution frequency(400-1600CPI) conversion Buiit in Mini receiver design. Low-voltage aiarming function Specification : Wireless carrier frequency: 2402MHz-2480MHz 16 wireless working channels, automatic frequency jumping Rated working voltage: 3.0V Rated working current: 15 mA Optical Maximum acceleration: 14 in per second Resolution: 400-1600CPI conversion Mice Net weigh: 53g Receiver net weigh: 10g Mice size :95 x65x37mm Receiver size: 18x14.5x6.5mm Key number: 4 System support: Windows 2000/XP/Vista/ 7 USB 1.0/ 2.0 Note : Battery life-spam will be different, depending on personal habit of using mice. Operation distance can be affected greatly due to using encironment. Package include: 2.4GHz wireless mouse x 1 Nano receiver x 1