The B503 is an ultra-quiet and strong steel-reinforced belt drive garage door opener that’s easy to install and operate. Perfect for attached garages, it’s precision engineered for years of reliability and quiet, smooth performance you can sleep through. Powered by Chamberlain’s Lift Power System, it delivers the highest lifting capacity compared to the ½ power class. Designed and engineered for safety and security, it features enhanced Triband frequency technology for superior range and performance, Security+2.0code encryption, Posi-lock protection against forced entry, dual-function wall control, 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.
Steel-reinforced belt drive and constructed with high-grade materials for years of reliability and quiet, smooth performance-perfect for attached garages
Powered by Chamberlain's MED Lift Power System, the B503 delivers the highest lifting force equivalent capacity compared to the 1/2 power class for effortless lifting and reliable performance
Superior Range - Includes 2 3-button remote controls that let you control up to 3 openers. Exclusive Triband technology boosts remote range up to 1,500 feet for a quicker entrance and exit
Trusted Safety & Security - Unmatched Security+2.0 100 Billion code encryption protects against hacking, and Posi-lock anti-theft protection stops attempts at forced entry
Installation made easy - our online installation videos, pre-programmed remotes, snap-lock rail system and Tech support ensure installation goes smoothly