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Steel-reinforced belt drive and constructed with high-grade materials for years of reliability and quiet, smooth performance-perfect for attached garagesPowered 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