LED monitoring indicator, the blue light is always on when the hard disk is inserted, and the blue light flashes when reading data The chip enhances heat dissipation, longlasting high temperature resistance, and more stable operation No need to drive plug and play, support mainstream for /for Linux/for NAS/for NAS Support for interface hard disk / optical drive / SSD solid state drive. Small size, easy to carry and store, convenient to use and with good performance. Due to different product batches, the appearance , which does not affect the use Colour:Black Material:PC Package Contents: 1x Expansion Card 1x data cable 1x power cable 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.