Amazing grace how sweet the sound. Diffuser is made from frosted glass. Extremely quite, no heat or vibration allowing for deep relaxation. Safe and easy to use. continuous mist: lasts up to 8 hours. Led light available in 8 colors. It can also be used with essential oils. Ul approved. Automatic shut-off timer or until water runs out. Add water up to fill line inside diffuser. Add oil. Oils are not included with this diffuser.