1) 4 denotation usb port, version 2.0/1.1
2)operation system. Win95 osR2/98SE/Me/2000/XP,Linux2.4and
3)transmition speed. High speed 480Mbps,full speed 12Mbps,lwo speed 1.5Mbps
4)power supply. USB 5V/500mA
5) HUB Circumstance Temperature: 0-70 centigrade
6) HUB storage temprature. 0-70 centigrade
7) HUB Operating Humidity. 10%-90%non_condensing
8) HUB Storage Humidity. 10%-90%non_condensing
9)Mouse Pad