The keyless car is a marvel of engineering. But how is it that they can start even when the battery in your key fob goes dead? The answer lies in science.

A 2023 survey found that over 60 per cent of drivers with push-button start systems had no idea their car had a hidden emergency start feature.

If you have a key fob and have ever been curious about the circle arrow button and its function, here's what it means.

Some automakers have even expanded the remote start button's functionality and/or use a different icon — that's why BMW has a diamond button on its key fob, for instance.