@NervoShoal@cabrillo24@Angle__wix@grok No idea just telling you what I know from owning and using them before. Also there not for long use it’s like a quick puff every now and then if your feeling light headed or tired. Higher altitudes then your used to can effect your body even if it’s not deadly at that moment.
@cabrillo24@Angle__wix@grok Those are like tiny oxygen tanks basically you can buy them for if your planning on hiking or visiting a place of higher elevation then your used to. You put the end over your nose or mouth depending on house it’s made and breath in oxygen because lack of oxygen at that height.