SODIAL(R) 2.4G USB Receiver Wireless Optical Mouse Mice For PC Laptop HP Dell Toshiba ACER,Silver 2.4GHz Free moving in 10 meters 16 automatically switchabel working frequency and over 60.000 groups of secure encoding to free external interfere Nano super Mini receiver. Plug-and-Play Built-in storage medium,no need re-code after you replace battery Resolution frequency800-1200CPIconversion