The 32 radio device smaller than a cell phone is designed to defeat the rolling codes security used in not only most modern cars and trucks keyless entry systems but also in their alarm.
Garage door opener signal blocker.
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433mhz remote control jammer is a small device that works against all remote controls of the chosen frequency in the 25 meters radius.
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This led the garage.
Hackers can use a code grabber device to intercept and copy the signal from your old garage door remote.
Thieves quickly discovered that by purchasing a few remotes from different manufacturers they could open nearly any door.
Newer garage door security measures incorporate rolling code which slightly alters the signal your remote sends to the door opener every time making code grabbers ineffective.
Since the doors used the same signal and code any remote could open any door.