A portable oxygen cylinder is a non-reactive having pressure high, seamless tempered steel container for compressed gas O2 that can be used for medical, therapeutic, or diagnostic purposes, as well as for home use.
So like all drugs oxygen has some side effects.
 The maximum cup capacity of this portable equipment is 7ml and the material is plastic from which it is made up of.
This Portable Compressor Machine for Adult and Child Daily Use is a device that consumes the lowest power of its kind and gives the same results.
Prescription is Required Per the FDA.
It is an electronic device that is made only for improving the concentration of the air.