Specification: 1. Mouse type: Optical Vertical Wireless Mouse 2. High Resolution: 800/1200/1600DPI adjustment 3. Button:Left/right Button+Forward/Back Button + 1 Scroll Wheel +DPI Button 4.Effective: 2.4GHz wireless transmission up to10 meters operating distance. 5.Net Weight: about 114g 6. Power:Bulit-in battery 7.Dimensions : about 123x75x62mm Feature: Tired of using the traditional grip Take a break from overly-clunky or uncomfortably tiny mice. The ergonomically-designed thumb rests and grips fit the contour of your palm for maximum comfort. Six buttons give you improved control over your computer's systems. Whether dragging and dropping, selecting large volumes of data, or casually gaming, this mouse provides a low-cost, effective solution for multiple computing needs. Easily adjusts the sensitivity of the mouse between 3 DPI levels (800/1200/1600) to suit both ordinary and gaming needs. Optical laser allows for quick response, precise movement, and smoother tracking. Made for increased functionality and comfort, this vertical mouse combines a handshake grip. Package Includes: 1 x Wireless Mouse 1 x USB Receiver