Green LED indicator should always be ON. ONLY if GFCI is malfunctioning, the LED indicator will turn OFF.
1.TR (Tamper Resistant) can protect children from sticking objects into the outlet and improper insertion of foreign objects.
2.Weather-Resistant design make the receptacle moisture-proof and resistant to atmospheric corrosion.
This GFCI receptacle has got ETL certification and the fireproof poly-carbonate housing keeps you away from fire risk. Cannot be reset if mis-wired.