?Durable and Long Service Life?Constructed with premium high-impact resistant thermoplastic materials and rational structure design, ensures superior strength and durability. Performed 6000+ times endurance factory test, which is twice the testing times of UL standard. ?Innovative Dual Protection System? Features twin solenoid and double Silicon Controlled Rectifier(SCR),ensuring an always-on GFCl protection to ground fault,which doubles the service life of GFCl as an added layer of protection. ?Always Safe?GFCl Plug shall automatically conduct self-test every 15minutes to ensure continuous protection.Auto-monitoring exceeds the UL requirement UL943 2018version. On initial power up, tests the GFCl within 3 seconds.66%Enhanced Service Life led indicator lamp integrates two-color function: Green/Red. Strong anti-interference design. Make sure GFCl works properly in the environment with several electrical equipment such as kitchen and washroom without interference ?WR Weather Resistant?Designed with enhanced corrosion and UV resistant components, weather-resistant receptacles are for extra durable use in outdoor location. ?Easy Installation? - Back and side wiring, no extra wiring required. The package includes detailed instruction. Ideal for use in indoor or outdoor occasions such as homes, offices, hospitals, schools.