Leviton GFRBF-T Self-Test SmartlockPro Slim Blank Face GFCI Receptacle with LED Indicator, 20 Amp, Light Almond 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 - detects and trips on actual ground fault even when self-test is being conducted 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 Slim, shallow design - reduced depth makes it easier to install in any electrical box, even shallow ones