The Ultimate Backup Aquarium Air Pump • Super Silent & Stable • Super Power & Reliable • Superior Battery Life • Airflow Control-Valve Features : • Automatically switches from AC to DC ( Battery ) mode during a power failure • Airflow Control-valve enables users to choose their preferred airflow • Battery On / Off Switch prolongs battery-life when device is not in use • Battery offers up to 10 hours of backup • ISO 9001 Certified Battery with superior battery features preventive overloading and discharging electronic wiring device to prolong the server life of the battery