Break the circuit in just 0., 025 seconds when ground fault occurrence in the circuit. Patented Self-Test Every 5 Seconds] The GFCI outlet automatically conducts self-test (auto-monitor) every 5 seconds to ensure the GFCI is continually working to protect people from electrocution, which exceeds the UL standards of self-test frequency of 3 hours ELEGRP Black 20 Amp 125V Tamper Resistant Duplex Self-Test ✅【UL Certified & 3-Year Product Support】ELEGRP GFCI outlets rigorously tested to meet or exceed UL943 & UL498 standards for safety and reliability. Ideal for kitchens, bathrooms, hallways, stairs, nurseries, and more. Backed by 3 years of product support, ensuring long-term performance and customer satisfaction. Tamper-resistant shutter system prevents young children from inserting unwanted objects into the outlets. Matte Black GFCI With Wall Plate ELEGRP 20 AMP 125-V Duplex Tamper Resistant Self-Test , With Screwless Wall Plate, UL Gfci Outlet UL & CUL Listed. 1-Pack 20 Amp GFI Electrical GFCI Outlet Self-Test Tamper Resistant (TR) Weather Resistant... ELEGRP GFCI Outlet with LED Nightlight, 20 Amp 5-20R Narrow Design GFI Receptacle ,TR Tamper-Resistant Ground Self-Test Fault Circuit Interrupter, Wall Plate Included, UL, 1 Pack, Matte Black ✅【Make Nighttime Navigation Automatic】With built-in night light, this GFCI outlet automatically turns light on in dark and off in daylight, delivers advanced safety and protection.