More than a few times I have been asked to recommend an essential oil diffuser that has the following features: (1) A light that can be turned off, (2) A large capacity tank, (3) Run time of 10 hours or more, (4) Not too expensive. This diffuser is all that and it&#x27;s highly rated. It&#x27;s my new favorite ultrasonic diffuser. And on top of all that, it only costs 25 bucks!!