Homeline™ Ground fault circuit interrupter protects people against electrical shocks. GFCI protection is required in wet or damp areas such as bathrooms, kitchens, garages, spas, pools and outdoor receptacles. Do not connect to more than 250 feet of load conductor for the total one-way run to prevent nuisance tripping. Use solid conductor only when No.14 wire is used. Provides overload, short circuit protection combined with Class-A ground fault protection. Yellow push to test button.