Liftmaster MGJ5011 Medium-Duty Gear-Reduced Jack shaft Operator for Rolling Grilles and Shutters 1/2 HP 115 VAC Standard Features: Choice of two Control Circuits: - Medium-Duty Logic Control Board (E) Click here for more features - Mechanical Dual-Relay (M) 3-button control station High starting torque motor with overload protection 24VAC control circuit Long-life dry type capacitor Industrial across-the-line reversing starter (30 Only) Heavy-duty worm gear-in-the-oil-bath speed reducer Type C2 wiring standard, B2 easily field set by moving 1 jumper wire Prewired to accept sensing devices Fully adjustable linear-driven limit switch mechanism Motor removable without affecting limit settings NEMA 1 type electrical enclosure Floor level disconnect for emergency manual operation 41B32 door sprocket and #41 drive chain included Baked-on high-durability black powder coat finish Approximate shipping weight - 58 lbs. 2-year warranty