Microsoft Wireless Mobile Mouse 1850 - Optical - Wireless - Radio Frequency - Cyan Blue - USB 2.0 - 1000 dpi - Scroll Wheel - 3 Button(s) - Symmetrical
Microsoft Wireless Mobile Mouse 4000 - BlueTrack - Wireless - Radio Frequency - 2.40 GHz - Red - USB 2.0 - 1000 dpi - Tilt Wheel - 4 Programmable Button(s)