Yes – they do. So make sure you have a good one!
A good quality house alarm is an important part of the overall package of security measures for your home – perhaps the most important.
Some people say they hear alarms going off all the time and nobody pays any attention. This can be the case but it is often because that person has an old alarm or has not maintained the system. A good quality house alarm – fitted by professionals – can significantly reduce the chance of being a victim of burglary.
Information from Cleveland Police: http://www.cleveland.police.uk/news/crimeprevention/blog-housealarms.aspx