2-wire Spring return damper actuator motor assembly, with mounting bracket welded. Application: bathroom exhaust ventilation duct. Heavy-duty motor with all METAL gears inside, stainless steel housing. Quality tested for over 150K cycles of flawless operations. Input power: 120 VAC, 50/60 Hz. MSI MS10A-MA02 Spring Return Exhaust Damper Actuator & Motor, 120VAC, No Switch