WoneNice Aroma Atomizer Air Humidifier LED Ultrasonic Purifier Diffuser for bedroom, reading room, hall, office etc.. Ultrasonic Diffuser breaks up water & aroma solution into extremely fine micro-particles, diffuses into the air as mist without heat which destroys the therapeutic ingredients in the aroma solution Air purifiers: the negative ions generates also remove particles as small as 0.01 microns, such as polutants, bacteria, fine dusts, smokes & viruses which cannot be removed by filtered air purifier Negative ioniser: negative ions increase the flow of oxygen to the brain & cells, resulting in overall well being It has three settings for amount of mist: high, medium and low. It comes with 7 color changing LED lights. LED Light Diffuser relieves depression, stress, fatigue & headaches, eases breathing & sleep better