From the Manufacturer
The new Leviton T7591 Tamper-Resistant GFCI Receptacle features a single receptacle with a guide light that is photo-sensor controlled, making it easier to locate the receptacle when it is dark. It is built on Leviton's patented SmartLockPRO GFCI Receptacle platform, and can accommodate the repetitive insertions experienced with plug-in vehicle charging. Meets NEC Code Requirements for use with electric vehicle charging systems. Recommended for use on a dedicated circuit. Also features SmartLockPRO which includes: Line/Load reversal indicator, "End-of-Life" Indication -prevention of reset in the case of compromised GFCI protection, and "Surge-Hardened" electronics to offer superior resistance to surges and over voltages.