The Basement Watchdog Big Combo is a pre-assembled, energy-efficient 0.50 HP primary sump pump combined with the Basement Watchdog Special CONNECT Battery Backup Sump Pump System. The primary pump is made of heavy duty cast iron and provides up to 4,400 GPH at 0 ft. lift. The battery backup system provides 24 hour a day monitoring and is Wifi capable. The backup system monitors pump, power, and battery conditions 24 hour a day. Plus, the controller exercises the pump weekly to make sure it stays healthy. The backup system includes a USB port that connects to the Basement Watchdog CONNECT WiFi module, allowing you to receive texts, emails and in App alerts for the ultimate peace of mind when youre away from home. The system is easy to install with little or no plumbing knowledge required. With two sump pumps in your pit, continuous monitoring and remote notification allowing you to receive texts, emails and in App alerts you can feel safe that your basement is protected.