This video created by an HGV driver reveals how drivers can use empty drinks cans to protect their cars from being stolen.
Adam Farmiloe's clever video shows motorists how they can block the signal from 'relay' devices which can be used to force entry to a keyless car.
Putting his key in a Coke can, he tries to operate the Ford car but finds that the key is not detected through the aluminium foil.
The simple technology functions as a 'Faraday cage' which means criminals cannot track the electromagnetic signals.
The 43-year-old from Wolverhampton says in the video: 'It's just a very simple, easy solution.
'It's the sort of thing you want to do as a very cheap option. Try it - if it works, it works.
'People say wrap them in silver foil, normal alloy foil, but that's quite thin and these cans are made of the same stuff.
'Put the key in, even when the lid's open, press start and no key detected. Hope it helps some people out and saves them £5 on a Faraday pouch to protect their expensive car.'
When he presses the start button with no protection around the key, the vehicle picks up the signal and the ignition starts.
But when he puts the key in a can of Coke there is no response as no key has been detected.
Mr Farmiloe then repeats the trick with cans of Fanta and Carlsberg and it works again though the top of the cans has been cut right off.
Keyless technology is designed to increase convenience for motorists as it typically means they need just a small fob to unlock their cars, and can drive by pressing an ignition button.
However, criminals are exploiting this with devices such as relay boxes, available to buy cheaply on Amazon and eBay for as little as £260 ($344).
The thieves can use equipment to capture signals emitted by certain keys which are used to start new vehicles.
Thieves can then drive the vehicle away and quickly replace the locks and entry devices.