Leviton's duplex receptacles are designed for a chic appearance, quick installation and durability. The impact-resistant thermoplastic design allows for a long service life and high performance in homes, offices, schools and other settings. Mechanical shutter mechanism prevents access to contacts unless a two-pronged plug is inserted, helping ensure that foreign objects will be locked out TR symbol on receptacle face assures they meet the NEC Section 406.11 code requirements Ultrasonically welded for additional assembly security Base and face made of high impact thermoplastic Convenient break-off plaster ears for best flush alignment