OPERATE GARAGE DOORS DURING POWER OUTAGE: Integrated Battery Back Up System for your Synergy 360/370/380 Garage Door Openers. Offers peace of mind during a power outage. INCREASED SAFETY & CONVENIENCE: No need to step out into bad weather or be in the dark if the power goes out. The Battery Back-Up System will open your garage door and turn the lights on for you, keeping you safe & dry during stormy weather. SUPER SIMPLE “PLUG & PLAY” INSTALL: The fully integrated battery system installs easily and doesn’t require any external power cords. PEACE OF MIND & FUNCTIONALITY THROUGH A LONG POWER OUTAGE: 10-12 Door operations over a 24 hour period before recharge. CUTTING-EDGE GARAGE DOOR OPENERS: Marantec utilizes German-engineered DC motors, digital technology & energy-efficient features to create residential & commercial garage door openers and accessories that offer safe, quiet, and reliable performance.