Supports SATA hard drive read and write data. Tool-free removable hard drives, supports hot swapping; Compatible with USB 2.0 / 1.1 and SATA II; High speed USB 2.0 data transmission up to 480MB/s; SATA II transmission speed up to 1.5GB / 3.0GB per sec; eSATA interface transmission speed up to 3GB/s; Supports 2.5" / 3.5" SATA HDD; One button back-up function; LED indicator of power and HDD reading / writing status.