Unique Floating Water Design: Innovative appearance imitating flying saucers, with an eye-catching shape and a higher level of appearance. Adjustable Air Flow: Feature a button to control the amount of air for dual outputs, allowing for your desired air flow to fully oxygenate your fish tank. Long Service Life: Manually adjustable air volume, longer battery life. Lithium Battery: The bubbler for aquarium fish tank comes with an in-built rechargeable lithium battery which is USB rechargeable, i.e it can be charged by wall charger, power bank, or laptop - very convenient. Extensive Applications: This whisper air pump can work as a standard air pump for aquarium, or as an emergency aerator pump during power cut, or as a fishing live bait aerator.The air bubbler for fish tank is ideal for both fresh and marine water.