[20Amp GFCI Outlet] The Receptacles continuously protect ground fault; prevent personal injury and risks of electrical fire caused by ground fault; a must-have for household electricity [Self-Test Function] The GFCI outlets meet the UL standard for auto monitoring, self-testing every 40s to ensure GFCI protection working properly; when detecting ground fault, the outlet will trip and quickly stop electricity flow to prevent serious injury [Easy to Install] Back & side wired available, back terminals for #14AWG solid copper wire only, side terminal screws for copper wire up to #12AWG; 4-wire cable clamp terminals secure cable ends, No loosening for long-term use, reduces short circuit risk [Tamper Resistant for Safer] Tamper resistant shutter effectively prevents objects from being inserted into outlet slots, protecting children from electric shocks; UL listed for safer during use, GFCI electrical outlet rated 125VAC 60Hz 20A [High Quality Material & Weather-Resistant] Made of i