Penn-Plax presents the Silent-Air Aquarium Air Pump with Battery Backup. This model of the Silent-Air Aquarium Air Pump is a real life saver! The SAB11 Air Pump plugs into an electrical outlet and monitors power at your home or office. If power becomes interrupted for any reason the air pump instantly turns on thus keeping your tank?s water safely oxygenated for your fish. In other words bubbles go on when power goes off! Penn-Plax is a manufacturer and distributor of top quality pet supplies who specialize in creating excellent pet products for animals both great and small.