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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+2.0 code encryption, Posilock 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.

Ultra Quiet and Strong Belt Drive

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

MED Chamberlain Lift Power System

Powered by Chamberlain’s MED Lift Power System, the B503 delivers lifting force equivalent to 1/2 HP, the highest lifting capacity compared to the 1/2 power class for effortless lifting and reliable performance you can count on.

Upgrade to Smartphone Control

Open, close, and know the status of your garage door from anywhere with your phone or tablet. Upgradeable to Smartphone Control with purchase of Smart Garage Hub (MyQ-G0301 required and sold separately).

Superior Range Remotes

Exclusive Triband technology boosts remote range up to 1,500 feet for a quicker entrance and exit.

Trusted Safety and Security

Unmatched Security+2.0. 100 Billion code encryption protects against hacking, and Posilock anti-theft protection assures that once the door closes, it stays locked.

Highest Quality material

Built from High-Grade materials.


10 Year – Motor.
Lifetime – Belt.