FeaturesThe WM126 wireless optical mouse from Dell offers you everyday wireless performance with excellent battery life. It is designed to create a clutter-free workspace with a reliable, Plug-and-Play RF wireless connection.SpecificationColor: BlackPointing Device Connectivity Technology: WirelessPointing Device Wireless Technology: Radio FrequencyMovement Detection: OpticalMovement Resolution: 1000 DpiNumber of Total Buttons: 3Scroller Type: Scroll WheelErgonomic Fit: Symmetrical.