GENIE 38957S 1/2HP CHAIN DRIVE 550 OPENER W/ 2-REMOTES (7' TALL DOOR) | The Genie Chain Drive 550 garage door opener combines powerful, reliable performancewith a smooth operation to create a long-lasting and easy-to-install garage door opener. The unit's electronic push-button programming makes installation and setup fast and easy. Complete with accessories, the system features a reliable DC motor that delivers quiet, smooth operation with soft start and stop dontrol, reducing wear and tear on the unit for long-lasting performance.