Features: The humidifier uses a variety of means to atomize the; maintain high humidity; and produce a number of natural negative oxygen ions; the cardiovascular system and metabolism of the human body play a protective role; paragraph humidifier large fog; Atomization of the high performance; And the working state of silence; Do not affect your life while using the work; Beautiful portable is the leader in the humidifier; Can carry; send the family; Send friends the best choice. Description: Product Name: Donut Shape USB Humidifier Material: ABS Shape: Round Color: White Size: 50x50x20mm Power supply: USB Function: Negative ions Tank capacity: 1 liter or less The number of fog mouths: 1 Mode of operation: Mechanical Timing function: No timing Water shortage protection: Support Line length: 1 meter Suitable for: Note: It is recommended to use a large cup with a large cup. Because the cup is small, the tension of the water will make it difficult for the water to enter the water inlet