Originally Posted by
paul.cymba
A171
820 25 26 and the replacement A
219 820 32 26 are both getting old. New ones are unobtainable and used examples expensive, considering that when you take them apart to replace the batteries you're likely to find them fried. A2048705726 is more modern and there's a plentiful (cheap) supply of used ones. Casing isn't quite the same and the connector different (although still 3 terminals). Does anyone know if it has the same PCB?
Here are two sirens that beep, 219 820 32 26 this has a 8 mm stud on it, so you’ll have to find a nut. The other is 171 820 53 26, this one uses a 8 mm screw like the Crossfire.
It is mentioned that they could be getting too old, no worries there as they have the manufacturing date printed on them.