SATA HDD backplane with 28mm HDD spacing.; Support SATA protocol 2.5 inch and 3.5 inch HDD only.; Large 4D power supply, curved corner power supply. SATA 6G speed, SATA 7P interface. (NAS-S 5Bay have double 4D interface); Support hot-swap, need to set SATA hard drive hot-swap mode in motherboard BIOS.; Each disc position has two LED lights, green for the power-on indicator, blue for the working indicator.; Pay attention to the size of the adapter plate, this model is not a universal model, there is no chassis and hard drive bracket to match, you need to develop your own chassis and bracket.