Aquarium Air Pump USB Rechargeable Oxygen Pump Fish Tank Bubbler High Capacity 4800mAh Lithium Battery Quiet Operation Durable and Portable Design Automatic Start-up Ideal for Indoor and Outdoor Use Features:  High-Capacity Lithium Battery: This fish oxygen pump is equipped with a high-capacity lithium battery, ensuring long-lasting performance. It can be charged via USB and can be used while charging, providing an uninterrupted oxygen supply to your fish. Intelligent Intermittent Working Mode: The oxygen pump operates in an intelligent intermittent mode, working for 10 seconds and stopping for 10 seconds. This ensures a continuous oxygen supply while saving a significant amount of power, thus extending the battery life. Quiet Operation: With a working noise level of less than or equal to 30 decibels, this oxygen pump operates quietly, ensuring a peaceful environment for both you and your fish. Durable and Portable Design: The oxygen pump features an ABS shell that is resistant to oxidation. It also comes with a silicone shock-absorbing pad to reduce vibration friction. With a buckle on the back, it can be clipped onto fish tanks, waistbands, clothing, etc., making it easy to carry around. Automatic Start-up in Case of Power Failure: In the event of a power failure, the oxygen pump will automatically start up, ensuring that your fish continue to receive a steady supply of oxygen. This feature makes it an ideal choice for both indoor and outdoor use, such as fishing. Specification: Power: 2W Air pressure: 0.02Mpa*2 Air volume:3L/min Air outlet: Double holes Applicable fish tank: 30-100L Battery capacity: 4800mAh Power failure self-start: Yes Continuous time: 35 hours Intermittent time: 70 hours Product size: 110*80*40mm Product weight: 428g Package size: 125*125*70mm Package weight: 430g Package list:  1*Oxygen Pump 1*Air Tube+Air Stone 1*Power Cable