Aopen O 35G - Optical - Silver - PS/2, USB - 5 Button(s) - Wired AOpen O-35G 5-Button Optical Dual Scroll Mouse General Features: Silver and blue design Five (5) customizable buttons (front scroll wheel acts as third button) Dual Scroll wheels - easy vertical and horizontal scrolling Ergonomic design USB - PS/2 interface Perfect for right handed and left handed users Optical Technology 800 dpi optical resolution 5-foot cable length on wireless receiver