Second one of this brand I have bought, they produce more than enough power to deliver my meds, very reasonably priced, last quite a while (I think the first one I bought was about 2 years ago). Quick delivery (when you need this for your meds 4 times a day, you don't want to keep waiting for it) Fortunately
I have a portable one in my car that I could bring in for temp use in the house.
My Dr. ordered one of these to administer my medicine. The first one would stop every 10 minutes. Supplier brought me out another one and it worked for about 6 days and now it just buzzes. Very disappointed. Fortunately I had a small hand held one to get me through until I could order a new one. I have serious lung issues and need these things to work.