This is a Ctek Ferrari Battery Charger Adapter and is the magnetic clip in type used on later Ferrari models from around  2015 onward, this includes, California T, 488, F12, GTC4 Lusso, 812, Portofino, F8 and many many more.
This will work with  Ctek branded chargers and uses the  Ctek standard comfort connector.
This device therefore facilitates you using any standard Ctek Branded charger as an alternative to encountering the significant expense of a Ferrari Branded Ctek unit. 
Also fits Aston / R.R / Bentley Magnetic charge points