In all cases, it is best to equip the door with an electric garage door operator instead of pull cord or pull chain. There are basically two categories of electric garage door operators: trolley (central) and jackshaft (wall-mounted). Since mid-2014, some operators come with the latest technology and can be controlled remotely via a smartphone, tablet or computer. Additionally, when at all possible, install a three-phase motor with the highest voltage available. If you choose to manually open and close your garage door, ask for a chain hoist when the height of the door exceeds 12 ft. (3.7 m).