Features: Humidifier use a variety of ways to atomize the water; to maintain high humidity room; and produce a certain number of natural negative oxygen ions; cardiovascular System and the human body's metabolism plays a protective role; This paragraph humidifier fog large; High-performance water atomization; And the working state of silence; Do not affect your life while you use work; Beautiful portable is the leader in the humidifier; Can carry; send family; send friends the best choice. Product Name: Donut 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 mouth: 1 Mode of operation: mechanical Timing function: No timing Water shortage power protection: support Line length: 1 meters Suitable for: household 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 below the humidifier. This will affect the fogging effect. Package Contents: 2x humidifier Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.