Features [8-in-1 ATX Power Supply Tester] - Support test motherboard 20pin/24pin/Molex IDE/Floppy 4-pin/PCI-e 6-pin/CPU 4-pin / EPS 8-pin (NOTE: can not fit for PCI-e 8-pin) / SATA connectors [1.8'' LCD Screen] -- Outputted Voltages shows on the 1.8'' LCD Screen, Easy to Read (The 1.8'' LCD Screen was Powered by 20-pin / 24-pin Connector) [Beep Alarm] -- When your power supply test value is beyond normal range, the Power Supply Tester would issue a buzzer alarm, Easy to Know [High Quality Plastic Enclosure] - Light and Easy to Carry, High Strength Specification Device Type: Power supply tester. Compatible with: ATX, BTX, ITX. Voltage source: 20/24 pin ( ATX - connector ). Voltage test: +12V, -12V, +5V, -5V, + 3.3V, +5V Stand by (SB) 12V power Good ( PG ). Connector: Floppy, HDD, CDROM, SATA, 4pin ( P4 ), 8pin ( Dual-CPU ), 6pin ( PCI-Express ). Operation Method 1 - Insert the power 20-pin or 24-pin and P4, P6 or P8 plug into the corresponding position of the power tester. (if Insert the 20pin or 24pin connector, tester alarms and displays LL, it needs to plug in 4P connector! Please make sure 4P connector is inserted in 4P position! ) 2 - Turn on the power supply, at the same time, "didi" sounds twice. If the values of each group do not flash, it indicates that the power input of this power supply is normal. 3 - The voltage of IDE / SATA / P6 / P8 interface is displayed by the three lights on the left of the power tester. If their voltage is normal, the three groups of lights (+ 12V, + 3.3, + 5V) will be on. If the light is not on, it indicates that the interface line group is faulty. Note :Special reminder: The power supply tester is not supported Hot Plug How to judge test results? 1 - The voltage of 20-pin / 24-pin / P4 interface is displayed by the 1.8'' LCD Screen. If their test voltage is exceeds the normal range, the buzzer will send out a warning sound of "di di" for a long time, and the corresponding voltage or PG value display status is flashing state, it means that the power supply is a fault source. 2 - The voltage of IDE / SATA / P6 / P8 interface is displayed by the three lights on the left of the power tester. If their voltage is normal, the three groups of lights (+ 12V, + 3.3, + 5V) will be on. If the light is not on, it indicates that the interface line group is faulty. 3 - If the voltage signal of a circuit is not detected (such as 20-pin or 24-pin connector) or the detected voltage exceeds the normal range, the buzzer will send out a warning sound of "di di" for a long time, and the corresponding voltage or PG value display status is flashing state, it means that the power supply is a fault source! NOTE: 1 - The power tester has no battery and is completely powered by 20-pin or 24-pin interface, if there is no 20-pin or 24-pin interface powered, tester screen will not light up and the value cannot be read. 2 - Please do not plug the interface in the wrong position or reverse, which may cause the power tester to smoke or damage your power supply. 3 - Special reminder: not supported Hot Plug, Hot Plug behavior can cause short circuits or other problems