No, not a bad one as it happens.
That's always my genuine advice to someone who wants a 'deterrent'.
Why waste time and effort on paying, maintaining, and installing a **** system when a decent bell, at the right height
and a flashy LED will put off 98% of burglars?
I don't have anything against DIY per-se, but when the design spec is a 'deterrent', I always say the above.