Straight connection don't need a USB cable. Small size,work well as USB Disk Driver,convenient to carry Hot-swappable, plug and play, no drivers needed. Support type 22*30mm 22*42mm 22*60mm 22*80mm Size SSD Please note that it supports SATA-based B Key SSD only. It does NOT support PCI-E based B key & any M key SSD. Full metal material