?Specification:  HDDs connector port: for SATA HDD&SSD HDD size:2.5 inch｣ｬ3.5 inch SATA One touch backup function Support USB 3.0｣ｬup to 480Mbp\/s Enable to backup into two hard disk｣ｬmax capacity reach to 8TB Support all 2.5 inch ｣ｬ3.5 inch SATA1\/SATA2 HDD&SSD Hot swap and play Different LED lights to show power and data respectively Supply stabke extrmal power with 12V\/3A｣ｬdon't worry about issue System compatibility: Windows2000\/2003\/XP\/Vista\/7\/8  Mac OS 10.3 OR higher  Size:   Note: When it start copy the CLONE led will keep flashing｣ｬ if it stop flashing｣ｬ cloning is complete Copy speed \u200b\u200bdepends on the speed of the hard｣ｬ the general Sata2 hard copy speed in 60-80M \/ s You can not connect the USB cable to it when it is in copy  Support Offline Copy   Package include: 1 x USB 3.0 dual SATA HDD docking 1 x USB cable 1 x charge cable     More Details: