A: This is an air pump. It fills the balloons with air not helium, so they won't float.
A: Yes. It works fine with "helium quality balloons." Does it make them float? Not unless you place them above it in the airstream to make them float. A gadget this size that's capable of nuclear fission for dispensing helium would be quite an accomplishment. Sadly, not in this century.
A: Unlimited. This is an electric pump that fills the balloons with air. There is no tank, so as long as you have electricity you can fill as many balloons as you want. It is a great time saver.
A: It is about as noisy as a hand held vacuum.
A: It is not a tank, it is an air pump. It fills the balloon with air not helium.
A: The instruction sheet says not to, but I don't see any reason why not. I suppose because mylar self-sealing valves can be flimsy.
A: This blows up latex balloons with air, not helium. Saved me a TON of time blowing up balloons for my son's birthday party last week. Love it!
A: This only inflates with air, not helium. That being said, it saved me a TON of time not having to blow up balloons by mouth for my son's birthday party!