Description Product Description         : A4tech OP-620D Wired Mouse Product Category             : Mouse SPECIFICATIONS Model：OP-620D / OP-620DS Type: Wired Ergonomic Design: Symmetric Sensor: Optical Resolution: 1000 DPI Buttons No.: 4 Port: USB Cable Length: 150 cm Net Weight:91 g (w/ cable) System Requirements: Windows XP / Vista / 7 / 8 / 8.1 / 10