Easy to install with little or no plumbing knowledge required! This pre-assembled Basement Watchdog Combination Sump Pump System provides both primary and battery backup pumping capabilities, offering complete protection and peace of mind. Pumping up to 3,720 GPH, the ? HP Cast Iron primary sump pump is both powerful and energy efficient, using only 3.5 amps. This system includes the Basement Watchdog Emergency Battery Backup Sump pump system that provides 24 hour a day monitoring of pump, power, and battery conditions. It will protect your basement from a power outage, primary pump or float failure, and provide extra pumping capacity when needed. The user-friendly controller will sound an alarm, give a visual light, and pinpoint the problem. The battery backup sump pump can run intermittently for days on a single battery charge from any Basement Watchdog Standby Battery. With the Combination sump pump system in your pit, you can feel safe that the Basement Watchdog is WATCHING OUT FOR YOU!. Includes: 1/3 HP cast iron primary pump, 12V backup pump, a 24 hour a day self-monitoring controller, 0.4 Amp battery charger, two dual float switches, battery box, battery cap adapter for fluid sensor, 2 pre-installed check valves, 1 ½ in rubber union, " Y" connector, and detailed instruction manual (battery not included - sold separately). Includes the Basement Watchdog Emergency Battery Backup System (model# BWE) with 24 hour a day monitoring controller that sounds an audible alarm, illuminates a warning light and describes what to do for easy maintenance. Provides days of intermittent pumping power on a single battery charge. Automatic 0.4 Amp battery charger. Compact design fits in pits with diameters as small as 12 in.. Free lifetime technical support. Fluid sensor monitors fluid level of the battery. <a href=https://www.homedepot.com/c/electronics_recycling_programs style=color:#F96302; target=_blank>Click here for more information on Electronic Recycling Programs</a>. 1/3 HP energy efficient permanent split capacitor (PSC) primary pump can save money on your electric bills. Dual float switches on both the primary and backup systems provide 4x the protection. Primary pump capacity 3,100 GPH at a 10 ft. lift and 3,720 GPH at 0 ft. lift. Pre-assembled system allowing for easy installation with little or no plumbing knowledge necessary. Backup system capacity 1,000 GPH at 10 ft. lift and 2,000 GPH at 0 ft. lift. Compatible with both wet cell and maintenance-free AGM batteries