Allows IDE hard drives & optical devices to be attached to USB (Universal Serial Bus) & SATA hard drives to ESATA connections Supports 2.5 inch & 3.5 inch hard drives Windows & Mac Easily convert SATA harddrives to External SATA & IDE hard drives to USBAllows connection of an IDE device to USB (Universal Serial Bus) & a SATA device to ESATA at the same time Power switch for safely connecting your device Plug n play