Keyless entry is a clever system that allows you to unlock car doors without handling the key. The car automatically senses when the fob is nearby and unlocks the doors for you, meaning the key can be stored in a pocket or bag and simply left there. Your car will also lock its doors once you have turned off the engine, left the vehicle, closed the doors and walked away. As long as the key is on your person, the car will take care of locking or unlocking the doors on your behalf. Keyless entry is becoming more popular on cars of all shapes, sizes and prices, so if you're looking for a more convenient way to lock and unlock your car, keyless entry might be perfect for you.
Keyless entry systems work using radio signals that are emitted from the car and a key fob that searches for those signals. When you place your hand on the door handle of a keyless car (in some cases you have to press a button), the vehicle will send out a short-range radio signal. If the fob is within range of the car's radio waves, usually around 5 metres, it will send its own signal back to the car and the vehicle's onboard computer will unlock the doors.
The same process takes place when you need to start the engine, but with a button located on the inside of the car that brings the engine to life. Usually, the cars onboard computer can determine whether the fob is located inside or outside of the vehicle, and will only allow the engine to ignite if the key is inside the cabin.