MAXIMUM DOOR SIZE MAX DOOR HEIGHT: Up to 14 Ft. MAX DOOR WIDTH: Up to 18 Ft. MAX SQUARE FOOTAGE: 180 Sq. Ft HEADROOM CLEARANCE REQUIRED: 3-inches from the center of the torsion bar MAX. DOOR WEIGHT: 850 lbs. WHAT'S INCLUDED Commercial Door Operator (LJ8900W) Cable Tension Monitor (041A6104) 48 Chain and Sprocket Push-Button Control Station (APBS1) The Protector System Safety Reversing Sensors OPTIONAL ACCESSORIES (SOLD SEPARATELY) 827LM MyQ Remote Led Light operates automatically with the operator and works with the MyQ App. 485LM Battery Backup Capable powers up the operator when the power’s out. 841LM Automatic Door Lock deadbolts the door automatically every time it closes.