Quantity: 1pc Size: 12.6*6.4*1.85cm Colour: Black 1.LCD's indicate the status of voltage 2.The power supply tester is a robust voltage, tester for PC-power supply, ATX BTX and ITX compliant, power supplies can be tested 3.The PC/ SPS is suitable for the ambitious hobby user, as well as for a quick functional check in specialized trade 4.The methods of operation:Plug power supply 24 PIN and P4 , P6 or P8 into the corresponding jack of the power test suite 1.Power on the supply of power, will hear "DuDu" ring , if no flicker then the power supply output voltage is normal 2.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