Size: 12*6.5*5cm weight:300g USB rechargeable Up to 70 hours. Built-in 2600mAh rechargeable lithium battery provides up to 70 hours of working time (interval mode). So it is suitable for outdoor fishing, carrying fishing and power outages, etc. It can be charged by devices with USB ports such as power banks, laptops, cigarette lighters and wall chargers. Strong air volumeThe air pump can generate plenty of air and ensure sufficient air circulation in the aquarium. In continuous air supply mode, this air pump will continue to generate air bubbles. Airflow up to 3 L/min. The atmospheric pressure is 0.018 MPa. In intermittent air supply mode, there is a 10-second pause every 10 seconds, which saves energy and extends the use time.Recyclable Economy Energy-saving and quiet The power of the air pump is 1W, so it saves energy and does not overheat when operating. 40 dB minimum at lowest rate. It will not interfere with your sleep while running. Applicable scenarios This quiet air pump is perfect for freshwater aquariums and marine aquariums, ideal for all tanks with a capacity from 5 to 15 gallons.