Extra-heavy duty industrial grade Lev-Lok® self-test GFCI non-tamper resistant receptacle, NEMA 5-20R. Patented bridge contact design provides individual sets of contacts for GFCI receptacle face and downstream receptacles; no power will be delivered to receptacle face if improperly wired (line-load reversed). Improved immunity to high frequency noise reduces nuisance tripping. Advanced electronics provides superior resistance to electrical surges and over-voltages. Low-profile design is easy to install in all electrical boxes. Patented SmartlockPro® protection prevents resetting when ground fault protection has been lost.