This Essence Diffuser has a 17oz capacity and uses state of the art wave diffusion technology to atomize essential oils for ultimate wellness. It also includes 4 timer settings and a convenient auto shutoff feature for low water levels. Has a longer working time up to 10 hours. You can turn on/off the diffuser and change the Light color, time mode, speed of the mist by yourself. he essential oils humidifier has 4 timer options: ON/60/120/180 minutes and two mist modes. You can set 7 LED light colors to cycle through or freeze on one fixed color. Perfect for improving air quality, moisturizing the air, relieving stress, adjusting mood and improve sleep quality. Also function as cool mist humidifier, air freshener, air purifier, night light for bedroom, living room, baby room, bathroom, yoga studio, SPA , office.