Description: WIDE RANGE OF APPLICATION PLACES - USB DC5V Power Supply, which means the humidifier can be connected with your laptop, power bank in your office, home, car or wherever there is a USB port or an adptor BATTERY  -  130ml water capacity, 1-2 drops of essential oil added in the water would be good choice. 35ml/hr mist output, around 4 hrs working time and auto shut-off once water run out. However, try not to power it on while there's no water inside. LED LIGHT - The light is designed hardly visible in day time but shining slowly & gently in nights, good looking and meanwhile protect your sleep ULTRA QUIET WORKING SOUND - On first use, it takes around 2-3 minutes for the water to absorb up the filter. The steam won't start until it reaches the top. If you want it instantly, just make the filter wet first. A spare filter is provided for every humidifier. Moreover, you can not even hear the working sound of this little quiet humidifier Brand Name: STEVVEX Gadgets Model Number:ST16GG123LK Capacity: 130MlL Power (W): 1w Voltage (V): 5V Noise: <36db Humidification Method: Ultrasonic Water-shortage Power-off Protection: Yes Function: Aromatherapy Use: Household Shape: Classic Columnar Application: 21-30㎡ Humidity Control: Touch-tone Classification: Humidification Mist Outlet Quantity: One/a Power Type: A.C. Source Type: Ultrasonic Humidifier Timing Function: No Installation: Tabletop / Portable Mist Output (gallon / day): 30ml/H Humidifying Capacity: 300ml/h Operation Method: Keyboard Type Voltage: 5V Size of Packaging: 100*100*150mm Weight of Product: 195G Features: Water filter,air cleaner,air purifier Used in: Home living rooms, offices, bath