Feature: 1. ULTRA QUIET OPERATION: Quiet oxygen pump features updated liner technology, ultra quiet operation, and superb air volume that can even drive 4 nano sandboxes. 2. POWER OUTAGE SELF START: Aquarium air pump starts automatically in case of power failure, AC DC power supply is switchable. High gloss spray paint surface with gorgeous colors. 3. WIDE RANGE OF APPLICATIONS: Quiet oxygen pump has a wide range of uses and a freer use environment, suitable for fishing, fish ponds, seafood pools, etc., To meet your different needs. 4. THOUGHTFUL TIPS: Intermittent work in accordance with the minimum air volume test up to about 72 hours, it is not recommended to open the maximum or more air volume when going out. 5. 10 SPEED ADJUSTMENT: Fish tank air pump has 10 levels of air volume adjustment and a touch screen display with touch controls for ease of use, which can be freely adjusted according to the size of the fish tank. Specification: Item Type: Aquarium Air Pump Material: ABS Use: Fish Tank Large Volume Of Oxygen Pump With LCD Display Maximum Air Volume: >9L Per Minute x 2 Maximum Air Pressure: 26Kpa Rated Power: 4W Endurance Time: > 36 <72Hours Battery Type, Capacity: 1 x Lithium Battery 18650 (5000mAh) (Shipped With Built In Battery) Size: Approx. 22x13x12cm / 8.7x5.1x4.7in. Package List: 1 x Aquarium Air Pump1 x USB Data Cable2 x Non Return Valve1 x Instruction Manual Note: Please allow some error due to manual measurement.