Humidification capacity is perfect. It would be nice if there was a little tank capacity, but for size it would be useless. The problem is that after turning off the engine the main unit will turn off, but after turning on the engine again you have to switch on the main unit again. It is very troublesome. Why is not it possible to maintain the state of keeping putting in? It is very troublesome to turn the engine on and off frequently. It is perfect if that point is improved.