Descriptions: It has a clear oxygenating effect with powerful airflow, stable air output, and uniform bubbles. Equipped with USB interface for easy charging. No noise for silent operation. Specifications: Product Name: USB rechargeable oxygen pump Nominal voltage: 5V charging Application: Mobile phone plug, charger, charger bank, computer USB, etc The product does not contain mountaineering clasps Product List: Mini Water Pump*1 See more product details 1.Safe Material: Mini water pump is made of copper movement. It has a slippy cover without sharp edges. And it is waterproof, corrosion-resistant, and not easy to break. 2.Continuous and Stable: Mini water pump submersible is continuous and stable with powerful airflow, stable air output, and uniform bubbles. It has an obvious oxygenation effect. 3.Battery Operating: Tiny water pump has a universal charging USB interface, compatible with rechargeables. It is recommended to use fast charging sparingly for high-powered phones, too much power may reduce the service life. 4.Simple to Take Along: The lightweight design makes you movewater pump with ease. And you can store and take it anywhere you want without damaging the fish. 5.Wide Usage: 5v water pump is appropriate for aquariums, fish tanks and for aquatic turtle tanks, Reptiles, Amphibians, frogs, and cichlids in any aquarium.