About this item 【4 Spraying Mode】: Cordless air humidifier is available to spray at only left port, right port, both ports and both ports spraying alternately. Refresh & clean air to release more oxygen, makes your surroundings smell sweet, protects leather item by more humidity to make you feel energetic. 【Wireless/Wired】: With built-in 4000mAh battery, the cute humidifier mini can keep working wirelessly up to 9 hours and support quick charge within 2 hour. Besides, the battery status indicator helps to display battery life. You can also plug and play via USB. When connected to a USB power supply and full of water, the dual-port spray can be used for about 16 hours, and the single-port spray can be used for about 32 hours. 【Automatic Shut-off and BPA Free Material】: The power of humidifier will auto shut-off once water is in low level. Made of BPA Free material, personal humidifier portable is a perfect ultrasonic humidifier for baby room nursery and kids. 【Quiet Whisper Design】: Humidifying the air at a low noise level of just 28dB, will not be disturbed whether you are sleeping, studying or working. Ideal for use in office, car, bedroom, yoga, travel. 【Large Capacity and Large Mist】: 1.3L big capacity water tank. 4 spraying mode, to meet your different demand. For one nozzle, the minimum spray amount is 40-50 ml/h, spraying up to 8 hours. When both the nozzles are in function, the spray amount can go up to 60-90 ml/h for 4 hours. At alternate spraying mode, sprays 20-30 ml/h mist with 10 hours long working time. When connected to a USB power supply and full of water, the maximum usable time is about 32 hours. 1. Q: When should I replace the cotton sticks A: The humidifier cotton sticks should be replaced after using for 2 – 3 months according to the usage and water quality, keep the replacement frequency reasonably and regularly to make spray more clear, bring you a better humidifying effect. 2. Q: How long does it take for a full charge? A: The charging speed of 1.3L depends on the input power of the USB power plug adapter. Generally, it takes about 3 hours to fully charge with a 5V 2A plug adapter. It may take about 5 hours to charge at a low power outlet such as a computer. When the humidifier is fully charged The longest use time can reach about 10 hours. 3. Q: What type of water should I use? A: Just use our daily tap water, purified water or distilled water will cause this humidifiers to malfunction. 4. Q: Can I add essential oils to this humidifier? A: No, this humidifier does not support the addition of essential oils, which will cause corrosion of the product and affect the service life. 5. Q: How can I clean this humidifier? A: The water tank can be rinsed, and other components can be wiped with a towel. Remember not to let water flow into the humidifier charging port, because doing so may cause the product to short-circuit and not work.