... or small fog by rotating the switch to control Description for Ultrasonic humidifier : 1,Energy-saving circuitry devising; 2,From left ... to right, the rotary button, LED lights, humidifier started work.; 3,The big or small fog ... carbon filter; 6, Automatic water cut-off protection device; 2012 Hot sale ultrasonic cool mist humidifier for home, office and car