A key fob with remote locking/unlocking and push-button start. A key fob with push-button start and keyless entry that owners can leave in their purse or pocket for virtually all functions.

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.

Push-button start key fobs protect your vehicle against theft. By ensuring that the ignition doesn't start until it receives a signal from its paired key fob, a keyless ignition system bars entry ...

Place the key fob directly on or near the sensor. Even without power, the fob can still be detected using passive RFID technology. Press the brake (or clutch) and push the start button.

Push-button ignitions work via the fob, also known as a "smart key," which allows a driver to keep the device in a pocket, purse or other place when unlocking, locking and starting the vehicle.

Push-button start has been, until recently, considered a luxury feature. That’s no surprise — starting your car with the press of a button feels like the height of convenience.

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

Cars have 'secret button' that starts engine even if your key fob dies Around 60 per-cent of drivers with push-button start systems had no idea their car had a hidden emergency start feature.