NATURAL ELEVATED HANDSHAKE POSITION - Mouse with ergonomic principles to prevent forearm tension, improves hand posture, and reduces pain caused by median nerve pressure; Textured rubber coating for a comfortable grip WIRELESS 2.4 GHZ TECHNOLOGY - Reliable connection with 30 feet of operating range and practical power On/Off switch on the bottom of the mouse allows for a smooth wireless experience with out interference PROGRAMMABLE BUTTONS - 5 Buttons and 1 middle click that can be programmed using Perixx driver to customize your mouse to suit your work needs (available on our website) ADVANCED OPTICAL TRACKING TECHNOLOGY - Adjustable tracking resolution with three DPI levels (800/1000/1600) allows smoother and more precise movement than a standard mouse on different kinds of surfaces CERTIFIED QUALITY - FCC, CE, RoHS qualified ergonomic mouse. DIMENSIONS - 4.87 x 2.67 x 2.43 inches WEIGHT - 0.22 lb SYSTEM REQUIREMENTS - Windows 7 & above