You are Buying a Brand New And factory Sealed Leviton 15 Amp 125-Volt Self-Test Tamper Resistant/Weather Resistant GFCI Duplex Outlet, White (3-Pack).... self-test GFCIs periodically conduct an automatic internal test to confirm that it can respond to a ground fault. with the slimmest profile on the market, the device allows for fast and easy installation, while Leviton's patented reset lockout mechanism prevents reset of the GFCI if it is not wired or operating correctly. The SmartlockPro Self-Test GFCI is the smart choice in ground fault circuit interrupter protection. Provides continuous ground fault protection - detects and trips on actual ground fault even when self-test is being conducted On initial power up, tests the GFCI within 3-seconds Auto-monitoring exceeds the UL requirement Auto adapts and shifts to more frequent testing if potential problem is detected Status indicator light provides simple, intuitive feedback on power and protection status as well as indication of line/load reversal Patented lockout action prevents reset if GFCI is damaged and cannot respond to a ground fault Electronics are designed to minimize any false triggers Reduced depth makes it easier to install in any electrical box......