Fully compliant with the Universal Serial Bus Specification version 1.1 and USB 2.0. Single chip integrated USB hub controller with embedded proprietary processor. Support 4 bus-powered/self-powered downstream ports. Driverless, hot plug and play. USB 4 ports for variety of external USB device connection demand. Support for Windows Vista, XP, 2000, 98SE, Linux 2.4 and Mac OS8.5 or over version. Dimension: L248mm × W213mm × H22mm. Black compact panel and smooth movement which suitable for all kinds of mechanical mouse and optical mouse. Blue light or seven-color light flashed around the pad. Microphone and speaker output. Internal microphone for direct talk on internet. Suitable for CD player, MP3 and MP4. Allows matching outside power of DC 5V/1000mA.