TradeMaster® Outlet branch circuit Arc Fault Circuit Interrupter (AFCI) receptacle. NEMA configuration: 5-15R. Feed-through protection. Two back-wire holes per termination add wiring flexibility, eliminate pig tailing and save box space. Ground terminal back-wire for faster installation. Auto-ground clip assures positive ground to metal box. Tamper-Resistant automatic shutter system prevents children from inserting objects such as hairpins or keys. High-impact-resistant thermoplastic construction for superior strength and durability.