I really like this diffuser - I have two of these and one from Rada Beauty. The Rada one is not nearly as good. This one does not beep when turned on or off, it tends to go longer than the 3 and 6 hours that is advertised, and it diffuses the oils nicely. The power light is green when on the 6 hour setting and red on the 3 hour setting. My son, who needs it really dark in his room, complains about the glow from the power light. The red one is much dimmer, so we always it on that setting for him. My daughter likes the colored lights as a night light, but I think they're really too bright for her small room. The green power light actually is a good brightness in my opinion!