I recently received the Levoit Vesync Core 400s Smart True Hepa Air Purifier to use. It came with the filter so it was ready to use. All I had to do was plug in. It has a lot of interesting features. When I turn it on there are colorful rings in the middle. Mine are always at blue, which is very good air. There is a fan button that helps control the speed it goes. I like to use it at night when I sleep. It’s not loud so I sleep through it. It has helped keep my air clear in my room.