The Chamberlain B730 is an ultra quiet and extra strong steel- reinforced belt drive garage door opener with anti-vibration technology. Perfect for attached garages, it's precision engineered for years of worry-free reliability and smooth performance you can sleep through. Powered by Chamberlain's Lift Power System, it delivers the highest lifting capacity compared to the ¾ power class. Designed and engineered for safety and security, it features battery backup, enhanced Triband frequency technology for superior range and performance, Security+2.0 code encryption, Posilock protection against forced entry, multi-function wall control, wireless keypad and more. Unit accepts two 100 watt max non-halogen or 26 watt CFL light bulbs (not included). Designed specifically for 7 ft. garage doors - extension kits required for 8 ft. and 10 ft. doors.