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The model Liftmaster 8550 door operator it will operate the garage door opener for 40 cycles within a 24-hour period, and recharges automatically when the power comes back on; an audible signal tells you when the power is out and the EverCharge® Standby Power System is in use. Meets all UL325 requirements. This garage door opener is equipped with a strong 3/4 hp motor that can lift heavy, wood, gatehouse-style doors as well as standard sectional doors. The belt-drive system helps the motor run smoother and quieter than a chain-drive opener. This is good news to sound-sensitive people and those who have a bedroom located over or near the garage as you won't have loud clanking and screeching coming from the Liftmaster 8550.