Product Details(click here) Liftmaster 3800 Installation Manual link
Introducing the Residential Jackshaft Garage Door Opener - 3800 The Residential Jack shaft Opener (RJO) was designed to provide you with a versatile solution to many of your unique and specialty installations. With a wall-mount design, it's perfect for applications like doors with a large radius track, minimal backroom and high-lift applications. However, it is not only for those unique installations since many homeowners today want to maximize the storage opportunity on their garage ceilings. Others have car lifts and seek every bit of headroom available, while others just want a clean ceiling for fixtures or entertaining purposes. With an abundance of high-performance features, the RJO fulfills the many needs of today's market. High-end performance features include: Remote Light - can be mounted on the ceiling anywhere in the garage Power Lock - deadbolt lock is activated by the opener each time the door is opened or closed Cable Tension Monitor - specially designed to monitor cable tension and help eliminate "cable throw" Adaptive Force Setting - senses changes to the door and environment and automatically adjusts force to the perfect setting Patented Absolute Positioning Technology - new design allows the electronic limits to be extremely accurate, even after a power outage, or in new construction where power is removed for an extended period during the final construction phase Powerful 24V DC Motor - provides slow start/slow stop for smooth operation Options and Accessories provide even greater versatility: EverCharge Battery Back Up System, Model 475LM - open the garage door even when the power is out...no more getting locked out of the house! New Wireless Control Panel, Model 378LM - will be available at the same time as the RJO! A perfect addition when a second control panel is needed. Additional Remote Lights - add as many lights to the ceiling as you wish!