I sold my McLaren 570s and never used this charger because I used the car almost every day. But to keep your battery healthy if you don't use your car much this is necessary. Plugs right into the 12V port in the front of your McLaren in the storage compartment. Compatible with McLaren 12c, 540c, 570s, 720s, 675LT, 600LT, 765LT and GT.