If you own any model pro realistic scanner and you hear the annoying loud beep sound every time, that is because it requires a 9 volts battery to be plugged in at all times. This is because it allows the stored channels or frequencies to be backed up inside the memory in case of a random unexpected power disconnection. So here is the solution.
1) Turn off your scanner.
2) Look at the back. There will be a square compartment plastic lid held in place with a small Philips head screwdriver.
3) Remove the lid. Attach a fresh 9 volt battery to the battery holder connector and close it back up.
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