Product Parameters: Product Name: USB wired mouse Resolution: 1200DPI Type of connection: USB interface Operating voltage and current: DC5 +/- 5% less than or equal to 100MA Flip wheel life: times Switch life: 5 million times Key Specifications: 60 +/- 5gf Key operation: 80 +/- 20gf Cursor positioning method: photoelectric : 98, 2000, XP, Vista version and so on colour:Black Material:ABS size:76mm*40mm*24mm Cable length: about 80 cm / 31.50 in (stretchable) Package Contents: 2 *Wired Mouse Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Small size, easy to carry, perfect for travel, kids friendly as well. 3D Technology High-resolution optical tracking for precise mouse movement. when pulled apart.Retractable cord enables it to be to be taken wherever desired for use on the computer whether , at work or anywhere else. Wide Compatibility All 98 / ME / NT / 2000 / XP / Vista / Win 7 / Linux or OS Plug and Play No drivers or programs required. Just plug and play.The cord length adjusts and winds/unwinds without tangling or stuck like some other wired mouse.