If your power goes out or the main sump pump fails, this Ace-In-The-Hole battery back-up pump will keep the basement dry. It pumps up to 23 Gallons per minute. Features include control panel with test switch, warning alarm and signal lights; corrosion-resistant thermoplastic body; and float switch for automatic 24-hour protection. Uses any standard 12V automotive battery. Battery is kept charged and automatically recharges when pump is used. Charging circuit powered by 12V 40VA transformer. 1 yr LMW. UL listed.