Daffodil WMS328B Wireless Optical Mouse 2.4GHz - Cordless 5 Button Mouse Adjustable Sensitivity (MAX DPI: 1600) for Laptop Netbook Desktop Computers Battery Powered (2AAA include.) Nano Receiver  Small enough to be left plugged in during transport 2.4GHz Radio Frequency Connection  Reliable operation from up to 10m 1600dpi Optical Sensor  Works on any non transparent surface Adjustable DPI  On the go adjustment of cursor sensitivity for precise control Ergonomic 5 Button Design  Comfortable use for right handed operators