Commercial spec grade tamper-resistant receptacle meet or exceed all existing codes and standards. NEC (National Electrical Code) requirements for commercial facilities necessitate the use of tamper-resistant receptacles and to bring you more options. Mechanical shutter mechanism prevents access to contacts unless a two-pronged plug is inserted, helping ensure that foreign objects will be locked out. Ultrasonically welded for additional assembly security. Body and face made of high impact thermoplastic for durability. Convenient break-off plaster ears for best flush alignment. Self-grounding clip staked on, will never fall off.