Gfci Receptacles From The Radiant Registered Collection Self-Test Automatically Every Three Seconds to Ensure Reliable Protection From Shock Due to Ground Fault Occurrences. Meeting National Electrical Code Requirements For Ground Fault Protection, Gfci Receptacles Make It Easier to Recognize and Fix Trips Right Where They Happen – No More Confusion At The Breaker Box. Also Including Tamper and Weather Resistance, This Model Was Designed For Use On Decks, Patios, Pool Areas, and Other Outdoor Spaces. Maxim