OP, are you talking about the tiny reset button you have to poke with a pencil or needle?
Sometimes small devices will store certain settings in something called RAM, which is a special type of inexpensive memory that requires a constant, small supply of power to remember the data. If power is ever lost, the data disappears. When the device is off, the RAM is still drawing a very small amount of power to keep everything stored.
That tiny reset button will temporarily remove **all** power to the memory when you push it, effectively forcing it to clear itself.
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