Jm575 master controller adopts the latest jmb575 chip solution, with high-speed transmission and stable performance, and is committed to meeting the needs of users for massive data space Aluminum alloy heat sink is more . In order to enhance the stability of operation, aluminum alloy heat sink is added Smart indicator each SATA port corresponds to a two-color LED indicator green: the device is connected normally Red: the read-write data flashes Computers that support SATA PM function can't drive. Computers that don't support PM function can't use it More widely used, ph58 can be combined with 2 ph57 to become PC I-E to 10 port SATA expansion card Support hard disk: HDD SSD supporting SATA protocol Support: 5 SATA devices System: for os // linux Speed: SATA 3 (6G) size: 80x22mm Material: Aluminum alloy colour: black Package Contents: 4 x Expansion card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.