4slots all-in-1 card reader: Professional manufacturer for card reader in Shenzhen . 1. USB2.0 high speed interface, with 480MB/s. 2. hot swappable, directly draw power from USB port, no external power required. 3. 4 slots design, directly support SD/MMC/RS-MMC/SDHC/MMC4.0/MS-MMC4.0/MMC MOBILE; MS/MS-PRO/MS-DUO/MS-PRO-DUO; MICRO-SD/TF, M2/MS-MICRO. 100% adapter free. 4. attractive design, with USB-A rotating plug on product, dimensioned at 47mm * 47mm * 12mm. 5. LED indicator to show POW and data activity.