Usage Tips:USB aquarium filter: portable USB micro-type oxygen pump, USB charging port, can be connected to mobile power supply, socket, car charger, laptop, very convenient. Silicone tube: The silicone tube has a small body, strong air volume, stable air output, uniform , and obvious oxygenation effect. Silent: The motor runs smoothly, has low noise and fast heat dissipation, bringing you quiet enjoyment. Portable: portable rope strap, convenient for hanging buckles in occasions, easy to carry and use Occasions: Suitable for occasions, easy to carry, easy to oxygenate, transport, fish farming, and fishing. You can use a power bank to extend battery life Please note:There is a slight color difference or difference in kind, it does not affect the use, please do not mind, thank you! Colour:As Shown Material:Plastic+electronic components Package Contents: 3 * aquarium oxygen pump Only the above package content, other products are not included. Note: Light reflection 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.