Leviton MGFT1 Lev-Lok Modular Wiring Device 15A-125V Extra-Heavy Duty Industrial Grade Tamper-Resistant Duplex Self-Test GFCI Receptacle, Brown Mating wiring module sold separately Modular Wiring Device  Requires Mating Wiring Module for Installation Dual function status indicator light provides simple, intuitive feedback on power and protection status as well as correct wiring Line terminal clamps initially held open to expedite first time wiring Back & side wire (external back wire clamps) Industry exclusive modular GFCI with feed-through terminals for downstream protection