Hospital Grade Smart Lock Pro Slim Tamper-Resistant GFCI Duplex Receptacles feature our patented reset lockout which provides an end-of-life indication and prevent reset if the Smart Lock Pro GFCI is damaged so that it cannot respond to a ground fault. Our Hospital Grade Smart Lock Pro GFCI"s include a dual function indicator light which acts as an installation wiring diagnostic and as a power indicator once GFCI is properly installed. The GFCI"s feature external wiring clamps designed specifically to withstand high torque and provide exceptional holding strength as well as positive indication of proper wire seating. Our shutter mechanism inside the receptacle blocks access to the contacts unless a two-prong plug is inserted for added safety.