"If it senses that you’re not breathing and you don’t push the reset button within 20 seconds, it will automatically inflate your BCD and float you to the surface."
I’m pretty sure every time I frame a picture I hold my breath more than 20 seconds, around hammerheads that flee when you exhale as long as I can. I can’t picture (pun) any photographer using this plus it sounds like an accident waiting to happen.