I bought a purmist several years ago so it is the classic that uses electricity. I've used it a few times when I've had sinus problems in the fall. I recently moved to a different state and somehow lost the plugin. I called the toll free number that was on my material and was referred to the website. The website didn't offer this item for purchase. I emailed customer service and they immediately got back with me and sent me a plugin free of charge. I have not had any issues with customer service and I highly rate them with a five-star rating