High performance dual fan that effectively prevents laptop computer from overheating  Smooth air-flow design to effectively remove heat from laptop computer  Adjustable volume control for accurate sound management  All-in-one USB 2.0 digital audio system provides exquisite sound experience  Built -in dual port USB 2.0 hub function  USB 2.0 specifications and compatible with USB 1.1  Suitable for 7"- 12" laptop computers  USB power supply, no external power supply is needed  Ergonomic design for comfortable use  Light and stylish for extra mobility  Patented arm speaker design creates prefect sound effects and extraordinary video and audio experience    Model:CWS-S200-WH  Materials:Plastic  Rated Voltage:DC 5V  Rated Current:DC 0.2±0.01A  Rated Speed:1500±10% RPM  Air Flow:28 CFM  Noise Level : 25 dBA  Dimensions : 230 x 160 x 20 mm  Speakers  Drivers : 1.5"Full-range Satellites drivers x 2  RMS Power : 2W x2  MAX Power : 3W x2  Frequency Response : 100Hz - 20kHz  Signal to Noise Ratio : > 80dB