General Tools BF20 Circuit Breaker Finder with Non-Contact Voltage Detector and GFCI Outlet Checker Automatically locates the breaker or fuse associated with any 110V outlet without tripping the breaker or blowing the fuse Indicates five common outlet wiring faults in GFCI and non-GFCI outlets and checks the functioning of an outlet's ground fault circuit interrupter Uses audible (beeper) and visual (LED) indications to safely (in non-contact fashion) detect hot (energized) outlets, lines and cables Features white LED work light Designed to safety standard IEC 61010-1