Very Good, but the user guide translation from Chinese to English is very poor, eg cleaning directions. The sequence of steps is reversed and out of order. Nearly All Chinese user guides use a very poor word for word translation without logical sequence. Number two problem is the hole added in the misting device between the hose and mask. This increases the mist too much and it goes into the eyes and face. Blocking it nearly completely allows it to work better. Delivery was okay even though it had been stepped on and the box was holed but device was not damaged. The price is excellent and great pump. Thanks, maybe you could add some ozone devices O3.