This aroma diffuser uses Ultrasonic waves to instantly vaporizer water and essential oil in the tank,to produce a cool ,dry fragrant mist. It has built -in water, birds natural sound and will give you a better feeling that closing to nature.Item No.:YYM-XXJ 100 002Capacity:100mlFunction:1.Humidifying2.Aroma diffusion(apply to water-soluble perfume only)Features:1. Automatic water level monitoring, automatic stop when dry, to prevent dry2. 4 working hours set:30/60/120/180mins3. Built-in water, birds natural sound, closer to natureSpecifications:Dimensions:109*109*154cmWeight:200gAdapter Voltage :DC 12VMist Amount:20ml/hTime Mode:30/60/120/180min