This. There's a reason there are regulations for this sort of product–people need to be able to rely on life-saving devices completely and with 100% certainty.

This. There's a reason there are regulations for this sort of product–people need to be able to rely on life-saving devices completely and with 100% certainty. At the very least, I'd suggest researching brudgers' post and adding a notice that the ADA requires accommodation visual alarms. edit: You really can't add enough disclaimers to something like this. The last thing you want to do is leave someone thinking this is going to save their life. Maybe as a tertiary failsafe, but you can't guarantee that's how it's being used.