1) 3-port USB2.0 hub built-in with USB2.0 retractable cable 2) Single port 5 in 1 card reader (SD-MS/Pro. MMC. SM. XD) 3) Aluminum board + transparent plastic shell 4) With blue LED light on the side 5) Auto switch, when you put the notebook on the cooler, that fans will be running Automatically. It saves power 6) Very slim and smart design of cooling pad system with large, built-in high-performance and extra quiet 3 fans which absolutely help to dissipate heat-air away from underneath the notebook computer for cooling down overall temperature of your system 7) Extremely heavy-duty construction of cooling pad to afford any weight or pressure Put-on 8) Power source supported easily by plug-and-play USB connection as self-power Mode 9) Convenient reliable and comfortable to carry 10) No need for any installation 11) Compatible with any notebook computer Outer packing: 20pcs/ctn Carton dimensions: 51x35x25cm N. W.: 535g