Today’s garage door opener remotes use rolling code technology. The code changes each time you use your remote. Code grabbers are not able to acquire these new codes, only the one that was used. The last code no longer works since the system has already changed the code used.
The earliest remote transmitters were similar to remote bomb detonators used in WWII. They used a single radio frequency to activate the garage door opener. There was no security as anyone with a garage door opener remote could open any garage door equipped with an automatic door opener.
In the 1970’s “dip switch” transmitters were developed to provide some security. Remotes came with 8 dip switches to set the transmitter frequency. These 8 switches provided 256 possible code combinations.
This was still not a great deal of security but a much better solution than before.
Unfortunately, few owners took advantage of this security option by changing dip switch settings from the factory default settings. It was still easy for thieves to find operators they could activate with a transmitter set at factory default.
This problem was solved by providing remotes with rolling code technology. Codes change automatically every time the operator is used. Each time a code is transmitted the system automatically creates a new code using an encoder. With billions of code possibilities, the same code is never used twice.
When you buy a remote control for your garage door opener, all the installation and code setting instructions are included.
Your garage door opener owner’s manual provides instructions for reprogramming your devices. It also gives the steps to erase all code settings before reprogramming all your remotes in the event an operator is lost or stolen.