For anyone with an older car who relies on 12V outlets to power their devices, these handy gadgets promise useful upgrades ...

In the past, it was rarely used for anything other than powering the onboard cigarette lighter; today, it’s an indispensable source of power for countless electronics, including our smartphones.

Depending on the age of your car, it might contain a round 12 V power outlet in the dash, or possibly in the elbow compartment. And depending on your own age, you might know that as the cigarette ...