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  • How do remotes work - by Marshall Brain

    1 September at 09:18 from atlas

    The two most common remote keyless-entry devices are:

    Some home security systems also have remote controls, but these are not so common.

    The fob that you carry on your keychain or use to open the garage door is actually a smallradio transmitter. When you push a button on the fob, you turn on the transmitter and it sends a code to the receiver (either in the car or in the garage). Inside the car or garage is a radio receiver tuned to the frequency that the transmitter is using (300 or 400 MHz is typical for modern systems). The transmitter is similar to the one in a radio-controlled toy. See How Radio Works for details on radio waves and radio transmitters.