Description:   Desktop PC Computer LED 20\/24 Pin 4 ATX BTX ITX SATA HD HDD Power Supply Tester   Features:    1. 100% brand new and high quality. 2. The SD power supply tester is a robust voltage tester for PC-power supply. 3. ATX、 BTX and ITX computer power supplies can be tested. LED`s indicate the status of voltage . 4. The PC \/ SPS is suitable for the ambitious hobby user 、 as well as for a quick functional check in specialized trade.   Specification:   1. Voltage source:20\/24 pin(ATX - connector) 2. Voltage test : +12V 、 -12V 、 +5V 、 -5V 、 +3.3V 、 +5V Stand by (SB) 12V power Good ( PG ) 3. Connectors : Floppy、 HDD 、 CDROM 、 SATA 、 4pin ( P4 ) 、 8pin ( Dual-CPU) 、 6pin ( PCI-Express ) 4. Size: 75mm x 61mm x 19mm   The methods of operation:  Plug power supply 24 PIN and P4 、 P6 or P8 into the corresponding jack of the power test suite Power on the supply of power、 will hear "DuDu" ring 、 if no flicker then the power supply output voltage is normal. If a certain voltage signal was not detected、 or the detected voltage value over the normal、 will issue a "DuDu" long buzzer ; if the corresponding voltage value or PG flicker too、 then the power is failed.        Package includes:         1 x Power supply tester  Details pictures: