Handheld USB Mini Humidifier Fan Cooling Rechargeable Spray Humidification Fan-a Key Touch With Variety of Functions,Multi-angle Adjustment Direction-Can be Used as Mobile Power Type:Handheld USB Mini Misting Fan with Personal Cooling Humidifier Multi-mode settings, touch a buttonspray pattern, spray fan + mode, the fan 1, 2nd mode Variety of power supply, access to the computer USB, access mobile power or charging head Equipped with 2000 milliamperes large capacity battery, super long battery life, mobile phones and other electronic devices can be used as mobile power Highly recommend add the distilled water (no deposit)into the water tank.the product will have a high frequency noise if the water shortage under the misty or fan+misty mode .please turn the device off immediately and add the water to enjoy the atomizing again.the mist function also will automatically stop after 1 hour spraying even you forget to turn it off.