PP Material and waterless auto-off: PP material ensures the safety of the diffuser itself, while water runs out, waterless protection ensures the diffuser stops working. Even when you leave or sleep, you can rest assured to use it without worrying about overheating. PLUG-ADD-PRESS: Brief to the end, three steps to use. 1, plug the power adapter 2, add water and essential oil 3, press button to adjust as needed. Quiet operation: It works without noise, never disturbs your work. You can turn off the night light before sleeping. Diffuser also stop working automatically while water runs out, making sure you have a stable sleep. 2 mist modes: You can set it at weak mist level, and it will work for 12-13 hours and last all night; or it can work 5-6 hours if you set it at a high mist level. Keep spraying until the water is running out, so that your room is full of fragrance immediately. Slim size for space-saving: Without taking up too much space, it's suitable to be placed on your desk, tea table easily, or pack it when you go.