I do think the crappy battery compartments are to blame with a lot of the water ingress problems used to put Vaseline round mine to seal them till the snag ears came out a much better fitting battery cover on those, Delkim should have really sorted that out especially on the txis costing so much my mates just brought some Gardner atts alarms which are very nice might be tempted myself lol very small and built like a tank he's retired his delkim txis for now as he fancied a change he isn't selling them either he hasn't had any problems with his apart from the vibration mode on his receiver playing up which delkim fixed in record time.