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Dell 2.4GHz USB Mini Wireless Mouse With Nano Receiver.
Adjustable optical sensor from 800-1600 CPI.
Automatically power saving, make battery working longer.
Compatible with USB 2.0 or 1.1.
Compatible with Windows 98SE, ME, 2000, XP, Vista, Windows 7.
Built-in storage medium, no need re-code after you replace battery.
Low Voltage Alarming Function.