Review on KEDSUM Battery Aquarium Air Pump: Ultra-Quiet Rechargeable Fish Aerator with Dual Outlets - Ideal for Fish Tanks, Outdoor Fishing, Fish Transportation, and Power Outages by Sean Skinner

Super quite and great design with the little rubber feet. No vibration. I leave it plugged in only as a back air supply to my 120 gallon African Cichlid setup. I tried to use it full time connected to a medium sponge filter but the pump isn't as powerful as many are describing. When going full time the pump eventually starts blinking red as if it isnt being supplied enough power and then shuts off eventually. This isn't good for full time use but great as a portable pump or emergency system for power outages as it will kick right on during power loss if connected.