ELECTECK 20 Pack GFCI Outlets 15 Amp, Outdoor Weather Resistant (WR), Ultra Slim GFI Receptacles with LED Indicator, Ground Fault Circuit Interrupter, Wallplate Included, ETL Listed, White GFCI: GFCI stands for Ground Fault Circuit Interrupter. A GFCI receptacle is different from a conventional receptacle. It has a safety feature that will trip and shut off power within milliseconds of detecting a ground fault, thus helps to protect against electrical shock. Certified: ELECTECK GFCIs are ETL Listed, which assures quality and meets specific electrical code compliance. Quality: Each unit of ELECTECK GFCI outlets are individually tested to close tolerances for function and safety before leaving the factory. Customers can trust ELECTECK GFCI to protect your home and family. Advanced Technology: These GFCI receptacles use the latest technology to consistently ensure exact tolerances for trip threshold. This ensures safety, reliability, and eliminates false tripping. Weather Proof Made with special ultraviolet stable thermoplastic to prevent discoloration. Tamper Resistant: These GFCIs feature tamper resistant outlets for where code requires, or for an extra margin of safety. Please note: Tamper resistant receptacles have a safety gate in the outlet to prevent unwanted objects being inserted. The outlet can be a bit difficult to plug into the first few times. This will become easier with multiple use. Screwless Wall Plate and Screws are Included: The included high quality screwless wall plate and screws conveniently save you time and money on your GFCI installation.