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 - M229Compatible with the port: ATX (compatible with partial BTX type)The PIN number: 24 pinNumber of sets of output: Four sets of different voltagecolour:blueMaterial:PC+ metalsize:12.8*4.8cmPackage Contents:2 x Power Supply BoardOnly the above package content, other products are not included.Note: Light 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.