1.transfer speed:MAX speed480Mbps,MED speed12Mbps,MIN speed1.5Mbps 2.mouse pad function 3.Certificate:ROHS,CE&FCC Specification(A) ... 1) 4 /7 usb port, compliant with V1.1& V1.22)System:Win95 osR2/98SE/Me/2000/XP,Linux2.4andMac ... . You should have one~ Key Feature: 1.Material: Plastic,Metal;2.Colors:: White, Sliver, Pink , Black, Blue etc. Customer’s color ...