4 ports USB2.0 hub Bus&Selt Power USB Hub.
Item Features:

Adds 4 USB 2.0 Hi speed Ports.
Fully Compliant with USB2.0 Specification
Support up to 127 Hi-speed device.
Backwards Compatible with USB1.1
Support data transfer rate at 1.5/12/480mbps
Individual Port Over-Current Protection
Friendly &ergonomic design , easily protection.
Provides up to 500mA to each port sufficient for diverse devices
Power adapter (selected 5V/2.1A output)
Plug &play installation.
Supports Mac OS 8.6 or above
Hi-speed Downstream port with USB A Female connectors
1 Hi-speed Upstream port with Mini USB 5P Jack.

System Requirements
Pentium based PC or Power PC Based Macintosh with available USB 2.0 port.
Mac/Windows  OS with USB2.0 support.

Packaging Include: 
USB 2.0 Hi-speed 4 ports Hub.
USB Cable
Power 2.1A