Sunshine-tipway Pc 20 /24 Pin Power Supply Tester Lcd Digital Display Screen for Btx, Atx,itx Power supply tester tests your power supply and avoid damage to your expensive computer equipment with this ATX power supply tester Simply plug the tester in to your power supply's 20/24 pin female Molex connector and the LED lights will be bright Voltage source: 20/24pin(ATX-connector) +3.3V, +5V, +VSB, -5V, -12V and +12V leads for monitoring voltage output Connectors: Floppy, HDD, CDROM, SATA, 4pin(P4), 8pin(Dual-CPU), 6pin(PCI-Express) Connects to your power supply's 20 pin Molex connector