I was just thinking about this whilst commenting on a Youtube video. I've heard it from motorhomes both on site and at my storage from time to time, no doubt some caravans have the same system. But noteably when I was on Malvern Hills CAMC site earlier in the year. There was a couple in a motor home and every time they went out (7am) or came home it was "DIDDLY DIDDLY DIDDLY DEE PI-PIP PIP PIP PIP PIP PIP!" Literally echoed around the site. Who makes these alarms? What is wrong with a quiet bleep to tell you the alarm is set? Is it just me that's noticed this. It can be annoying early in the morning!