... 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 by rotating ... ; 6, Automatic water cut-off protection device; Best Seller Ultrasonic Humidifier/unique humidifier/ decorative humidifier the hot sale model