Mouse A4tech OP-620F black USB:Classic Optical Mouse in black with perfect accuracy in motion with high sensitivity at 800 DPI. The optical sensor works on a wide variety of surfaces, does not require a mouse pad and does not need to constantly be cleaned. Besides the two mouse buttons, the mouse is also equipped with a scroll wheel for easy movement of documents or web pages that also serves as a third button. Connects to computer via USB.Specifications: Sensitivity: 800 DPIInterface: USBButtons: 2 and scroll wheel (third button)Color: Black