CRAFTSMAN 0.5 HP Smart Chain Drive Garage Door Opener with MyQ Cordless Reciprocating Saws turning functional planes into artful 1000088971 turning functional planes into artful moments Patented rotating brush plate is designed to provide equal power in reverse and to easily back out bound up bits CHAIN DRIVE: Rugged steel construction delivers toughness and durability you can count on LIFT POWER: Reliable Lifting Force of 1 2 HP is ideal for light daily use on a 7 ft garage door extension kits are required (sold separately) for an 8 ft door (CMXZDCG478) or for a 10 ft door (CMXZDCG4710) SECURE ACCESS: Each time the remote control is activated