S-Series Electronic Sensing Bilge Pump, 500 GPH, 12 VCompletely automatic with manual override Submersible and ignition protected High efficiency, low amp motor Stainless steel shaft Includes backflow preventer Will turn on every 2 1 2 minutes for about one second to sense for water and will continue to run until water is removed Water is kept in check between 1 8" and 3 8" depths Max. Flow Rate: 500 GPH Voltage: 12 V