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The memory of my FX-500 is suddenly empty, how is that possible?
Alphabetical order of contacts is not correct
Beeps every 10 seconds
Can you also disable the 20-second wait before dialling?
What is the range of the alarm button?
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Advice on battery use and testing.
Can I replace the battery of the alarm button?
Does the alarm go off if the button is pressed for longer than 4 seconds?
How do I disable the alarm in case of "false alarm"?
Which button cell battery goes into the alarm transmitter
Doorbell amplifier FD-35
Quick start guide FD-35
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