Industrial Door Opener Trolley Max Door Height (Ft.) 14 Max Door Width (Ft.) 22 Motor Type Continuous Duty Motor HP 1/2 Voltage 115 A Safe and Easy Way to Operate Commercial and Residential Garage Doors Reversal System Internal Auxiliary Reversal Helps Prevent Door and Opener Damage and Operator Injury if an Obstruction is Hit Radio Receiver Built-In Rated For Up To 25 Cycles Per Hour At Peak Periods Up To 80-90 Cycles Per Day Ability to Control and Monitor with Smartphone