Diamond Photoelectric USB Computer Wired Mouse $ 7.41 Product Details: Type: Optical Mouse Mouse size: ordinary mouse (100-120mm) Connection with computer: wired Photoelectric resolution: 1200 (dpi) Number of keys: 3 (keys) Interface: USB Adjustable resolution: three levels and below Operating distance: 1.3 (m) Working method: photoelectric Wheel direction: four-way wheel Line length: 1.2 (meters) Product size: 1106527mm Package Contents: Mouse X1