Chamberlain 0.5 HP My Q Smart Chain Drive Garage Door Opener with MyQ and Wi Fi Compatibility and Battery Back Up Combination Wrenches transitional designs can mount to transitional designs can mount to the wall or ceiling Emergency battery back up not included in this version Buy with confidence with a 5 year limited warranty Dimensions: width 9 1 4 in Retaining Wall Length (in Monitor and control your garage door from anywhere with MyQ® Access your garage door even during power outages Know you’re safe while meeting requirements of California SB 969 Lifting force equivalent to 1 2 HP Fits garage doors up to seven feet high Box includes 3 button remote one year chain warranty