If the indicator (LED) glows green, you have installed the GFCI receptacle correctly and it is working properly. For an added layer of protection, the GFCI regularly conducts an automatic internal test to confirm that it can respond to a ground fault, provides continuous ground fault protection. The GFCI outlet automatically conducts a Self-Test(the red light will blink once) every 40 seconds to ensure the GFCI is continually working. GFCI Outlet 20 Amp, UL Listed, Self-Test GFI Kenya 5 Pack - POWAWINI GFCI Outlet 15 Amp, UL Listed, Self-Test GFI Receptacles, TamperResistant, Weather Resistant, LED Indicator, with Decor Wall Plates and Screws, Indoor or Outdoor Use (Black Weather Resistant - Constructed with advanced UV stabilized engineering to provide superior corrosion, temperature, and UV resistance, preventing discoloration and aging, ideal for outdoor & indoor use. Self Test - Two Indicator Light provides simple, intuitive feedback on power and protection status. Tamper Resistant Receptacle prevents young children from inserting unwanted objects into the outlets. GFCI Outlet - Constructed with premium high-impact resistant thermoplastic materials and rational structure design, ensures superior strength and durability. When the GFCI receptacle reaches the end of its' life the red indicator will turn on, it reminds you to replace the outlet in time. The 5-Pack GFCI Outlet is a reliable choice for outdoor installations, featuring weather-resistant (WR) and tamper-resistant (TR) protection Safty - The POWAWINI GFCI Outlet meets UL-Listed, 15 Amp, 125 Volt, 60HZ. Indoor Outdoor Electrical Outlet 15 Amp Gfci Receptacle WR Weather Resistant GFCI Outlet 15 Amp - Self- Testing, Tamper-Resistant, For Indoor & Outdoor Use, White Gfci Outlet Outdoor Self Test GFCI With LED