Features 1A 1*20/24-pin power supply tester for ATX/SATA/HDD power supply. 2Prevent electrical disasters by periodically testing power supplies to detect problems before they damage your computer, monitor voltage output. 3The green LED will illuminate when your device is running smoothly. 4This new ATX power supply tester can test 4PIN/6PIN/8PIN HDD power connectors and 20PIN/24PIN FLOPPY, very powerful. 5Rugged plastic, plug-in design, can test PC 20/24 pin, PSU, ATX, SATA, HDD. Specification Features: A 1*20/24-pin power supply tester for ATX/SATA/HDD power supply. The green LED will illuminate when your device is running smoothly. This new ATX power supply tester can test 4PIN/6PIN/8PIN HDD power connectors and 20PIN/24PIN FLOPPY, very powerful. Specifications: Material: ABS Size: Approx. 9*7*2.8cm/3..54*2.76*1.1inch Color: Black Package list: 1 x Power Supply Tester Note: Power tester instructions: Power the power to be tested. Check if the seven lights on the right (+3.3, -12V, PG, +5VSB, +12V, -5V, +5V) are on, all lights up is well.