1. With power output indicator. 2. With module switch to turn off output. 3. The output terminal can pass the maximum current. 4. With output protection fuse,four groups correspond to four road output. There is a -12V,a +12V,a 5V,a 3.3V terminal. Each output take a 5A fuse. Overcurrent ,fuse can be replaced by yourself. Each power rail has a corresponding ground connection; all of the power rails are brought out to a binding post. About the 24pin port: The 24pin port powers the computer motherboard in the host computer. Usually, this port is used together. Model:XH - M229 Compatible with the port: ATX (compatible with partial BTX type) The PIN number: 24 pin Number of sets of output: Four sets of different voltage colour:blue Material:PC+ metal size:12.8*4.8cm Package Contents: 3 x Power Supply Board 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.