Super Long Time for Diffusing the Oil: It can last above 48 hours for add water once diffuse the essential oil with the flowing water | Humidify the dry air a little and will not add too much moisture to the air: Adding ambiance to your living room, office, bedroom,or anywhere you need to add a relaxing touch. the flowing water can add some negative ion and energy to the environment | 7 changing colors lights : The night light create a relaxing & comfortable atmosphere that is good for sleep | Safe Material:the product is made with BPA free and food grade material | Built-in Battery: It can work seperately without connecting to the power. When the battery is fully charged, it can work for more than 15 hours. | Compact Dimension: Measures 6.7'L*6.7W*9.53H(17*17*24cm)-Ideal for Bedside table,desk, or small space