The Air Buddy-BCD will mount on any standard size quick connect hose on your buoyancy compensator.
It is out of your way until you need it. It swivels in any direction, so it is just as easy for you as your dive buddy to use.
It functions equally well upside down as right side up.
To get your supply of breathing air, just bite it gently with your teeth and feel the air flood your mouth.
Many companies are now making power inflators with a built in alternate air source.
All of them, except the Air Buddy have the same problems. Because they have a diaphragm, if they breathe easily they will free flow when not in use.
You can't hold the power inflator over your head to bleed air and breathe through it at the same time.
The Air Buddy may be disconnected from the power inflator during use and kept in the mouth to breathe while the power inflator is held over the head to bleed air.