Perlerare - Air Humidifier, Mini Ultrasonic Humidifier with 2 Adjustable Mist Modes, usb Portable Humidifier for Auto Home Office Bedroom (Blue)

300ml water tank design can moisturize the air for 4-6 hours Auto shut off after 4 hours and press the switch to restart Ultrasonic cool mist for humidification - 30-45ml/hour Quiet operation below 30dB USB powered, convenient for carrying