PHCC B-2200 Pro Series 2400 Battery Backup Accommodates the fluid sensor for the Pro series sump pump systems Runs the pumps longer for more hours per charge Made in south Korea Accommodates up to two (2) B-2200 batteries for 100 hours of pumping* Runs pump weekly to test for proper operation Displays percentage of power remaining in the battery Alarm can be silenced during a power outage Designed for use with maintenance or maintenance free batteries Battery is empty-sealed dry