Features: brand new and high quality for Comply with: universal serial bus 3.0 standard. Usb 3.0 interface has a transfer rate of up to 5Gbps and is backward for usb 2.0/1.1. 4 usb devices to be connected at the same for time. The usb interface can provide 5v 2a power for external devices. With two power supply modules, no additional power supply is required. Specifications: Model: PCI-E -USB3.0 -T4B Chipset: for Nec chip Interface Type: PCIE Port: 4 Ports Usb3.0 Size: approx 120 x 85x70mm/4.7X3.3x2.75in for Comply with: universal serial bus 3.0 standard. Usb 3.0 Speed : 5Gbps and is backward for usb 2.0/1.1. Power: 5V 2A Support : Linux/for windows xp/7/8/8.1/10 Package Includes: 1 PC x 4 Port Usb3.0 Pci for Express Card note: Please allow 1-3mm error due to manual measurement and there will be different color as different display, please understand. Thanks.