Now when the power goes out, your garage door opener still goes up. The stylish 3850 has a unique feature that no other system can offer. It's the only opener with the patented EverCharge^TM battery backup system built right in to power the opener and all of its safety features when you need it most.

Always charged and ready, it provides the highest level of safety and convenience imaginable. Plus, it's possibly the quietest system ever created. The powerful 12V DC motor features a belt drive system that provides ultra-quiet operation, along with smooth start and smooth stop to reduce the noise of the garage door as it opens and closes. Perfect for homes with a room above the garage.

The Difference...
Chamberlain® offers the only opener that features an integrated battery backup system to reliably lift and close the garage door even when the power goes out.

• Ultra-quiet DC motor with belt drive system
• Our very best accessory package
• Now you can still operate your garage door opener for 40 full cycles within a 24-hour period if your power is down
• Safety and security features will continue to operate, ensuring your family is still protected in a power failure
• Alerts you when in use - an audible signal tells you when the battery backup system is operating