Front-panel adjustable leakage current trip from 0.3 to 12 mA One-second or continuous testing Automatic failure shutdown, with visual and audible alarms Recessed high-voltage connections Front-panel NEMA 5-15R three-prong receptacle on ac models Zero start/reset in event of failure Meets UL 120-k½ requirement > Each Unit Includes Test probes with alligator clips for ac models Cat. No. 25507 high-voltage probe Cat. No. 25136 return probe Cat. No. 25149 complete assembly, 4 ft [1.2 m]