Wayne WSS20 Primary and Back-Up Sump Pump System With Switch Genius Technology, 3450 Gallons Per Hour 2700-Gallons per hour in 115 volt mode with 10-feet of lift 720-Gallons per hour in backup-mode with 10-feet of lift Designed for 12-inch diameter or larger sump basins Requires one 40-ampere hour or one 75-ampere hour battery 5-Year limited warranty