Leviton X7899-IGO 20-Amp, 125-Vac Industrial Grade Isolated Ground GFCI Duplex Receptacles, Tamper-Resistant, Orange Ground contacts are isolated from device strap - prevents electrical noise on common building ground from disturbing sensitive electronic equipment Meets tamper-resistant requirements (NEC 406.12) Wraparound steel strap provides superior durability in abusive environments External wiring clamps provide visual verification of termination; clamps initially open to expedite first time wiring Slim profile provides 25% more room for wiring in wall box