Portable Mini Humidifier: 220 ml water tank delivers a steady cool mist up to 35 ml/h for fresh indoor air while traveling or at home. USB powered by the included cable from a laptop, power bank, or wall adapter. USB Humidifier With Light: Builtin soft night light with 7 color options. Cycle through colors by long pressing the control button, or fix a favorite color, or turn the light off for ambient decoration. Cool Mist Diffuser Function: Easy touch operation provides immediate mist output with quiet performance below 30 dB, making it suitable for bedroom, nursery, office, or car use without disruption. Automatic PowerOff Safety: Integrated water level sensor auto shuts off when the tank is empty, preventing dry burning and providing peace of mind during extended use overnight or during work hours. Use scenarios Bedroom or nursery: silent operation plus optional night light helps create a comfortable sleep environment for adults and children. Office or study: maintains comfortable humidity with minimal distraction to work or focus. Car or travel: compact design fits on a desk, tray, or hotel surface to improve cabin air during trips or commutes.