Data transmission rate: high-speed 480Mbp, (theoretical value) full-speed 12Mbps, low-speed 1.5Mbps; It can support the connection of up to 127 USB devices, at the same time for each USB interface; External port: USBx4, internal port: USB- A/Pinx1 System requirements: At least one available 32-bit PCI slot on the personal computer; Supported : Windows98SE/Me/2000/XP/NT 4.0/XP 64-bit/ Vista, Linux, Colour:black Material:PCB+metal Package Contents: 1 x USB2.0 expansion card 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. 2. Support PCI 32-bit bus, bus speed is 33MHz, PCI standard version 2.2 5. USB2.0 interface: Compliant with Universal Serial Bus (USB) specification revision 2.0, complies with Enhanced Host Controller Interface (ehci) specification revision 1.0, compatible with Universal Host Controller Interface (uhci) specification revision 1.1, backward compatible USB1.1 specification 1. Chip: 720101F1 (BGA) 3. Support PCI bus master channel 4. Compatible. Plug and play.