This card allows users to connect up to 6 SATA HDD or SSD to their system through a single M. 2 PCIe slot, expanding their storage capacity significantly. ^^ Using the latest for ASM1166 chip solution, high speed and stable performance, dedicated to meeting users' needs for massive data space. ^^ The light is on when the corresponding interface has a device, and it flashes when there is data read and write. ^^ aluminum alloy heat sink is added on chipset to make sure chipset working stable. ^^ plug and play, easy to operate, easy to use, and have excellent performance.