The Thermaltake Max 5G 3.5" SATA Enclosure comes with active cooling using dual ultra-silent 80mm fans with blue LEDs to ensure data integrity during file transferring between external hard disk and the host computer. These LEDs can be easily turned off with a built-in switch on the back of the enclosure. The Max 5G supports blazing file transfer speed utilizing SuperSpeed USB 3.0 transfer speeds of up to 5Gbps. It is also backwards compatible with USB 2.0 and 1.1 hosts.