Insten USB Optical Scroll Wheel USB 2.0 Mouse, Red/Black This optical mouse will glide across your desk without having to use a mouse pad. It can be used on almost any surface because it uses sensors to record the movement optically. With no mouse ball, there are no parts to get dirty, so cleaning is a snap. Features Posting Device Host Interface: USB. Movement Detection: Optical. Speed: 28 inches / second. Resolution: 800 DPI. Frame Rate: 3000 frames / second. Dimensions: 4.5 x 1.5 x 2.5 inch (L x H x W). Cable Length: 56 inch / 4.6 feet. Color: Red / Black.