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.
It will work with Ctek branded chargers and uses the  Ctek standard comfort connector as used on Ctek Chargers
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.