2.4 GHz RF Wireless Technology with On/Off Switch - This mouse works at any angle with a range of up to 30 ft. with no wires to get tangled. The On/Off switch helps conserve battery power plus the low battery indicator helps you know when it is time to change batteries.Ergonomic Vertical Design - The vertical design provides better support for your forearm minimizing wrist pain that can come from twisting.Adjustable DPI Switch and Back/Forward Buttons - Switch DPI easily from 800, 1200 to 1600, and access to back/forward navigation shortcut without driver.Plug-and-Play - Simply plug the mini USB receiver into a USB port and you will be up and running. No drivers required, works with Windows or Mac OS.