Yep, I figured that would be your response, and that is fine. I would point out, though, that it is quite possible and effective to break a glass window without making enough noise for anyone to notice. I've had it done to me, and I was in an adjacent room at the time. They used an adhesive film to hold the glass in place and then cracked out around the edge of the pane, then pulled the film back with all the broken glass stuck to it. Then they lifted the latch and would've got right in but for the cat that scared the by-Jesus out of them.

A siren with a window trigger would've been almost as effective as that darn cat.