Depending on your age, you may recall a time where a single key could lock and unlock a door, and even as these types of keys evolved to include the first power-locking fobs, insertion of the key would always work as a last resort after the touch button operation. That being said, eventually, transponder keys replaced the original fobs which meant that manufacturers did away with the tedious button-pressing models and created a more innovative fob that didn’t require the user to do anything other than be in a certain range. This brings us to the most modern car keys and other types of entry keys using tiny radio transmitters to grant users access once the signal is achieved. These keys work by transmitting a code to a receiver in the car or entryway which will unlock the door upon receipt of that correct code. The transmitter (key) and receiver (car or entryway) must be synchronized, which means that if your key fob is damaged, you will not be able to transmit the signal and will remain locked out until it’s fixed or a new key is created. Since today’s key fobs could have more than a trillion possible codes they are more secure and must be synchronized to receive the correct signal.