Feature: 1. Premium Material: Made from high toughness materials, this aquarium air pump is safe and reliable. You don't need to worry about quality issues even for long term usage. 2. Super Silent Working: The fish tank air pump works super quietly, ensuring that your aquarium environment remains calm and comfortable. 3. Effective Aeration: This aerator pump significantly improves the oxygen levels in your aquarium, effectively enhancing the water quality and aiding in healthy fish growth. 4. Adjustable Airflow: Featuring precise airflow adjustment, you can easily adjust the airflow according to your needs, offering more flexibility for your aquarium needs. 5. Rugged Construction and Easy to Use: The aquarium air pump features a sturdy structure, compact and mini body, do not occupy space, convenient to store and use. Specification: Item Type: Fish Tank Oxygen Pump Material: Plastic + Electronic components Size: Approx. 20x11.5x11cm / 7.87x4.53x4.33in Battery: DC3.7V Lithium Battery, capacity 4400mAh (built in battery); Tested Water Depth: >80cm. Package List: 1 * Oxygen Pump2 * Air Disc2 * Check Valves1 * Air Tubing1 * Power Cord1 * Plug1 * User Manual Note: 1. Place the oxygen pump at a position 25CM above the water surface of the fish tank to prevent backflow into the water when the oxygen pump stops; if the oxygen pump is placed below the water surface of the fish tank, a check valve must be installed. 2. The oxygen pump is not waterproof, so avoid water intake to prevent damage. 3. To prevent accidents, do not place the oxygen pump in areas with flammable materials. 4. Before maintenance, unplug the power plug or turn off the power switch.