One that sometimes gets lost in the mix but is actually quite useful is that small button on your door handle. It's found on all types of cars — and all types of car owners are confused.

Losing your front door key will become a thing of the past with the ERA Protect Smart Universal Door Handle – because you are the key. And this month we’ve got five of them, worth £216 each, to give ...

Instead of a simple, familiar mechanical latch, it’s now common for a car’s exterior door handles to remain flush against the door until the car is unlocked, requiring an electric motor to open.