Those are neat. My interest is more as a signaling device though.

When a bear hit my motion detector alarm (pretty dang loud... as in hurt your ear loud) it had zero effect on my bear. He paused for about 3 seconds......never even ran a few steps away. The whole time he was munching my granola the alarm was going off. Probably woke every one up on Sawbill for 1/2 mile.

Like all creatures though bears are individuals and I suspect a goodly number might just head for the hills........but I have already seen it isn't for sure.

These might also work as extremely effective practical joke tools. "Time to wake up" ;D...........just sayin