Leviton 7899 SmartLock Pro GFCI Receptacle, 20A, 125V, Brown, New, Sealed As a leading proponent of electrical safety, Leviton is continually working to improve product design and help ensure the proper installation and testing of GFCIs. That leadership role continues with the introduction of Leviton?s new SmartlockPRO GFCI. From a true dead-face design for line-load reversals to Leviton?s unique patented professional grade lockout action as an end-of-life indication, the new SmartlockPRO GFCI sets the highest standard of people protection of any GFCI on the market today. Features: Faceplate included True Dead-Face Design with LED Indicator for Line-Load Reversals The SmartLockPRO End-of-Life Protection Advantage Automatically tests the GFCI every time the RESET button is pushed in. The GFCI will not reset if the GFCI circuit is not functioning properly By blocking reset of the GFCI if protection has been compromised, SmartLockPRO reduces the possibility of end-users incorrectly assuming that a reset GFCI outlet is providing ground fault protection when it actually is not A line-load reversal diagnostic feature is provided which prevents the GFCI from being reset and stops power from being fed to the GFCI receptacle face or through to downstream devices. A green LED indicator on the GFCI?s face also illuminates to alert the installer to a line-load wiring reversal The trip latching mechanism in SmartLockPRO GFCIs is a one-piece "T" design for efficient operation There are 4 sets of contacts for load terminals and face. SmartLockPRO GFCIs use a patented bifurcated bridge contact for efficient operation The SmartLockPRO GFCI with lockout action is designed and patented by Leviton