Feature: 1. Painting Workmanship: The surface of aquarium oxygen pump adopts high gloss spray painting method, the color is gorgeous, and it comes with 2 check valves (to prevent water from flowing back). 2. Adjustable Air Volume: The air pump can adjust the air volume, which is adjusted by the potentiometric knob, which is convenient for adjustment. 3. Quiet Operation: The fish tank oxygen pump runs ultra quiet, no noise, and it will not disturb your rest when placed at home. 4. High Performance: Aquarium pump adopts upgraded liner technology, the power is not false, the gas volume is large, and it can even drive four large sand tables. 5. Applicable: Suitable for a variety of occasion, aquarium oxygenation, aquatic product transportation, outdoor fishing, seafood market, easy to use, large gas volume. Specification: Item Type: Aquarium Oxygen Pump Material: ABS Maximum Air Volume: >2 x 10L/min Maximum Air Pressure: 30Kpa Rated Power: 5.5W Application: Large VolumeOxygen Pump for Fish Tank. Package List: 1 x Aquarium Oxygen Pump2 x Check Valve1 x Instruction Manual