3C card is the standard size SD cards, SD all the support equipment, only 2.1mm thickness. directly through the USB data transmitted to a computer without the slots. mouth Trend : 3C card small, powerful, can directly replace U disk; direct three links card will replace the SD Card. The emergence of the three links card, will directly undermine the digital partners, reader market space. Technical performance : full speed USB 2.0 interface, reading and writing speed of about 12M/6M/s. 3 C card thickness of 2.1mm, the thinnest U disk. Three links card use to point its full thickness of the plating process, resistance to abrasion, and corrosion. Three 3C card will be a long-term gradual retail price and the ordinary SD card line to replace SD