1) 4-port USB hub a) Fully compliant with universal serial bus specification version 1.1 b) Single chip integrated USB hub controller with embedded proprietary processor c) Supports four bus-powered d) Driverless, hot plug and play e) USB 4-port for varieties of external USB devices connection f) SD card can be inserted g) Driverless (P&P) for Windows XP, 2000, 98SE, Linux2.4 and Mac OS 8.5 version 2) Stereo speaker: a) USB stereo speaker powered by USB or external power supply b) Internal stereo drive and microphone built for internal charting c) Internet radio channel using d) Earphone, microphone output connection capability e) Suitable for CD player, MP3 and MP4 3) Mouse pad a) Black compact panel and smooth movement which suitable for all kinds of mechanical mice and optical mice use b) Flash blue light or seven colors light around the pad c) Cable length 1.5m for USB and audio d) Dimensions (W x D x H): 248 x 213 x 18mm e) Allows matching outside power of DC 5V/2,000m