EASY TO USE. SIMPLY PLUG TESTER INTO ANY CIRCUIT PROTECTED BY A GROUND FAULT RECEPTICLE (110 - 125 V AC) AND PRESS BLACK BUTTON TO OVERLOAD CIRCUIT.. TEST FOR SEVEN CONDITIONS GROUND FAULT INTERRUPTION OPEN GROUND OPEN NEUTRAL OPEN HOT HOT/GROUND REVERSE HOT/NEUTRAL REVERSE AND CORRECT WIRING.. SUCCESSION OF YELLOW AND RED LIGHTS PROVIDES INDICATION OF CIRCUIT STATUS OR SPECIFIES WIRING ERRORS.. TESTER TRIPS GFCI BETWEEN 6 - 9 MA. TESTS STANDARD OUTLETS GFCI OUTLETS EXTENSION CORDS.. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov -