Sold as 1 Each. Black. 40 times faster than USB 1.1 products, plug-n-lay, hot-swappable. USB cable tucks away when not in use. It is very easy to use. Connection type: 4 x USB 2.0. Supports a data transfer rate of up to 480 Mbps. Power consumption: 5 VDC, operating temperature: 20 - 50 deg C. Black. Host interface: USB 2.0. Backward compatible with USB 1.1 specifications. Overcurrent protection. Connection type: 4 x USB 2.0. Humidity: 20 - 80% RH, (non-condensing), housing case: plastic. Self-powered. Compatible operating systems: windows 95, windows 98, windows mE, windows NT, windows 2000, windows XP (32-bit and 64-bit), windows vista (32-bit and 64-bit), windows 7 (32-bit and 64-bit), mac OS 9, mac OS 10.0, mac OS 10.1. 4' cable included.