TWO SPRAY MODES AUTO SHUT-OFF – This humidifiers has two mist modes: Continuous and intermittent mode. On continuous mode, it will automatically shut-off after 4 hours. On intermittent mode, it will automatically shut-off after 6 hours. It shut-off when the water level is low. Thus, you don’t have to worry about the humidifiers being damaged in the absence of water. You can use it at night without worrying about safety. ONE BUTTON CONTROL – The portable USB humidifiers is very easy to operate. One button controls all functions, you simply need to press the power button every 1 second to control the mist. Keep pushing power button for 3 seconds to enable the night light and colorful light function. QUIET ULTRASONIC OPERATION – Ultrasonic humidifiers produce a near-silent frequency 26dB (quieter than a library) ensuring ultra-quiet operation. This humidifiers won’t bother you while sleeping and working. It can effectively moisturize dry skin and help you reduce skin peeling. PORTABLE MINI HUMIDIFIER USB POWER SUPPLY – Portable and small design is very easy for you take to anywhere. The USB Power Supply compatible with any device USB port which ensures it can be used in the bedroom, office, car. VIVID COLORFUL CYCLING LIGHT NIGHT LIGHT – This cool mist humidifiers has a VIVID colorful Cycling light setting creates a peaceful ambiance while delivering a soothing mist. It offers maximum relaxation for you. The night light could improve your sleeping quality.