Leviton 7899-GY 20 Amp 125 Volt, SmartlockPro GFCI, with Indicator Light, Nylon Wallplate and Screws Included, Gray Automatically test the GFCI every time the RESET button is pushed in. The GFCI will not reset if the GFCI circuit in not functioning properly Patented lockout feature for added safety prevents RESET if the device is wired incorrectly or if the GFCI protection is lost Dual Function LED provides indication of power availability and also alerts to a line/load reversal during installation Expanded wiring options with nine back-wire holes. Two for each line and load connection plus one for ground with an internal clamp Trip threshold meets or exceeds UL requirements