This thing pumps out the mist like crazy!The power supply is rather large, but it has a good length of detachable output cable running to the mister. The mister unit is rather large with the floats attached, but works very well as long as it's got a good 5-6+ inches of water to float in.A couple safety notes - 1) the instructions warn that the unit is NOT designed for continuous use: "The atomizer is easily damaged [the main board overheats] when used continuously for more than 12 hours." It would be nice if the unit would have a built-in timer, or include an outboard timer/controller, that is fixed to a maximum time period to avoid this risk; it doesn't, though, so you're on your own. 2) This unit also needs a GFI protected outlet, as the unit's power cable does not have one built in.