Ultra-Quiet Operation – Whisper-quiet ultrasonic technology ensures peaceful use in bedrooms, offices, or while traveling. Auto Shut-Off Safety – Automatically turns off when water runs out, preventing damage and ensuring safety. Portable & USB-Powered – Compact design with USB power makes it perfect for home, travel, or desk use. Soothing Night Light – Built-in soft LED light creates a calming ambiance for better relaxation and sleep. Notes: Before work it is necessary to Take out the cotton wick from the humidifier and soak it with water before using. If the mist is significantly reduced, you need to replace the cotton swab. it use by USB Cable. Specification: Color: White, Green, Pink Name: humidifier Working voltage: DC 5V Material: silicone/PP/ABS/Electronic component Amount of spray:40ml/h Working current: 400mA Water tank capacity: 220ml Use time: 5-10h Power supply: USB Applicable area: 10-20 square meters Noise: less than 36dB Features: 1. SUPER QUIET: Runs quietly. It would not be disruptive while you sleep 2. Large capacity,dry protection, infiltration and Moisturizing 3. Automatic power failure protection,anti-dry 4. Mini size, lightweight and compact, easy to carry Notes: 1. Please allowed 1-3cm differences due to manual measurement, thank you for your understanding! 2. Due to the difference between different monitors, please understand that the picture may not reflect the actual color of the item.