The power board has an LED voltage display, which can display the voltage of the main power supply in real time. The 4PIN floppy drive can be switched on and off synchronously when connected to the main power supply. Press the white button to turn on the power switch. When the power cord is plugged in and the power switch is pressed, the three-color light LED flashes and the LED display shows the voltage. Suitable for common server power supply (including but not limited to those): DPS-1200FB A, DPS-1200QB A, PS-2751-5Q, PS-2751-LF-1F, HSTSN-PL12, DPS-700LB D, PS-2112-5L, DPS-750RB A Specification: Size: approx. 92x90mm/3.62x3.54inch Package Includes:(3 Pack) 1 Piece Breakout Board 12 Pieces 50cm Cables