I bought one of this while back and returned it. Thus is as far as I can see is the same model. It sends puffs air and there is a reservoir that takes tiny amount of liquid and its vaporised into the puff of air. Liquid ones I mentioned have a large reservoir of water and continuously send the jet of powerful water through the small hole nuzzle and water jet either pushes through the gaps in the teeth and dislodge foods or as it hits the surface of the teeth it dislodge the bacteria. S
This is a water floss type
I owned a Philips airfloss for many years until the hinge on the inlet for water finally gave out. Tried one of the £15 Amazon specials and find that the irrigation is just as good but the device is more fiddly to use. It's down to preference but I'd by the Phillips and pay the extra any day. It feels more solid, is more compact and the water jet feels more powerful.
Not as good as water floss type, also this one still needs a small amount of water to work.
Also interested to know this have a cheap 1 from Amazon that to be fair works pretty well but would happily pay more if the performance was genuinely better