Tamper resistant grounded Duplex receptacle meets the 2008 NEC requirement. The Shutter mechanism inside the receptacle blocks access to the contacts unless a 2 prong plug is inserted, helping ensure hairpins, keys, etc., will be locked out. Quick wire pushes in or side wired terminals. Heavy duty construction offers long, trouble free service life. Shutter mechanism inside the receptacle blocks access to the contacts unless a two-prong plug is inserted, helping ensure hairpins, keys, etc., will be locked out TR symbol on residential receptacles assures they meet the 2008 NEC requirement Ultrasonic heavy-duty construction offers long, trouble-free service life Heavy-gauge, rust-resistant steel mounting strap Shallow design for maximum wiring room Wallplate sold separately