Description: ULTRASONIC COOL-MIST TECHNOLOGY: Safely moisturizes the air for up to 16 hours of single-nozzle spray and 8 hours of dual-nozzle spray so you can breathe easily and get more restful sleep. The double spray design can be adjusted according to different weather and environmental humidity to enjoy a comfortable humidity environment. 3-LITER WATER TANK: Provides perfect coverage for bedrooms, offices, and other medium or large-sized rooms OPTIONAL NIGHT LIGHT: Long press the spray button switch for 3 seconds to turn on the colorful night lights. Offers soothing glow for maximum relaxation. CONVENIENT WATER ADDING: Refilling has never been easier! Just pull out the lid gently, you can easily and quickly add tap water. SLEEP TIGHT: While you are sound asleep, our humidifiers for bedrooms moisturize the room at the noise level. The unit is as quiet as a ticking clock. Specification: Appling area: 21-30㎡ Water tank capacity: 3 liters The number of mist vent: 2 Spray volume: single spray 35ml/H; double spray 70ml/H Plug interface: Micro USB Package Includes: 1 Piece Humidifier Note: Water-soluble essential oils can be added, 3ml, but it is not recommended. The quality of essential oils is good or bad. If there are more impurities, the spray port will be blocked after a long time.