I dive deeper then 10ft WAY deeper,-so if it is only rated to ten/ why would I need it AFTER a good long deep dive,and no one is around ??my mask might NOT be on CORRECTLY for the diver in distress- but I damn sure will be flailing my arm’s and screaming my lung’s out trying to get EVERYONE’S attention SUN OR NOT !- at this price- I will use my whistle/safety sausage and moon mirror before I purchase something as frivolent... !!