The Hygger High Efficiency AC/DC Rechargeable Aquarium Air Pump HG087 is a versatile and reliable device designed to provide essential oxygenation for fish tanks. Equipped with a built-in rechargeable lithium battery, it offers up to 23 hours of continuous operation or up to 24 hours in intermittent mode when disconnected from the power outlet. This air pump seamlessly switches between AC and DC power sources, making it ideal for both daily use and emergency situations such as power outages. The pump features a user-friendly interface with multiple oxygenation modes that can be easily adjusted using simple buttons, allowing users to control airflow rate according to their specific needs.