Ac/Dc Pro 2 Air Pump, Dual - Rechargeable BackupProduct Description Ac Dc Pro 2 Air Pump, Dual Rechargeable Backup Ingredients Key Features Two air outlets provide increased aeration coverage Lithium ion battery seamlessly takes over during power loss. Operates up to 16 hours on a single charge, or up to 45 hours in Power Save mode Designed with noise reducing technology for discreet operation. Keeps oxygen levels stable in multiple aquariums or larger tanks Prevents fish stress and fatalities