Twin outlets with auto charging design. As power failure, it can last to work uninterruptedly. Double vents, two adjustable design. The output air flow can be adjustable. As power failure, there are continued and intermittent pumping modes for your option. As using continued pumping mode, it allows up to 26 hours and; intermittent pumping mode, it allows pumping up to 34 hours. Shock-absorbing device inside. Strong pumping power, operation noise (<45 dB) and low vibration. It adopts high quality materials for prolonged service life. It uses rechargeable battery that no worry in case of blackout. Carefully designed protection circuit to ensures the safety of battery charging and to prolong battery life. This product can increase dissolved oxygen and remove harmful matter in water. With on/off switch control. Output: 5L/min