Most modern vehicles allow drivers to lock them centrally, with just a click of a keychain.
Keys use radio waves to communicate with a receiver in the car and by sending a unique code you can lock or unlock from a distance.
But radio signals can be muted using devices that interrupt or confuse the signal being transmitted.
With the help of radio silencers, the thieves block the remote locking of the cars by their owners. Therefore, motorists are advised to listen carefully to ensure that the locking mechanism has worked.