@carolwill3404 There are several choices on Amazon. I had one by Ezona that I liked but it stopped working after a few months. The one I have now is from Aroma Season Store. It was only $20 and is still working going on a year. I do have a battery pack that I use with it but I think you can plug it into a wall outlet with a power adaptor like you would with a phone. It has a reasonably long cable to it.