Siren activated automatically when motion detected

If it can’t be added to cams, what about a stand alone siren that is activated from motion stand alone and from connected devices. Watching the video hours later after the thief has broken car window and made off with the loot does not help since most are wearing hoodies and face coverings. We need a loud siren to scare them away before they have time to steal. C’mon get with the engineering dept. and get it on the market.