HUB converter with high-speed card reader Are External Power: No external power supply Nature Interface: USB extension HUB 3 USB ports can connect a printer， U disk， you can drive with more than one hard drive， the largest hard drive can drive 2T. 4 slot can insert TF card reader， SD card， M2 card， MS card， to meet a variety of needs Super seven interfaces Ultra-high-speed transmission Blazing blue light