The ClearPOWER P2 has a portable battery and docking station that is integrated into your home's circuit breaker panel. Three circuits from your home, of your choosing, are looped through the unit. If the grid goes out, the ClearPOWER P2 senses this automatically and routes power to the 3 circuits through the battery. This way your fridge, lights, and whatever else you’ve chosen can stay powered in an outage, even if you’re not home.