Tamper resistant receptacle. SmartlockPro GFCI, monochromatic, back and side wired. NEMA 5-20R. Nylon wallplate, screws and self grounding clip included. Polycarbonate body material. Brass triple-wipe 0.031 thick line contacts. Plated steel terminal screw. SmartLock, buttons match face colour. Automatically test the GFCI every time the reset button is pushed in. The GFCI will not reset if the GFCI circuit is not functioning properly. By blocking reset of the GFCI if protection has been compromised, SmartLockPRO reduces the possibility of end-users incorrectly assuming that a reset GFCI outlet is providing ground fault protection when it actually is not. The trip latch mechanism in SmartLockPro GFCI's is a one piece T-design for efficient operation. Compatible with all Decora devices and wallplates.