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The Quietlift 750 belt drive garage door opener is an ultra-quiet garage door opener with a steel-reinforced belt, making it the ideal choice for homeowners where sound could be an issue. This garage door opener has a powerful DC motor with GenieSense technology standard that will smoothly lift your sectional garage door up to 7' high and up to 500 pounds. 8' tall garage doors will need extension kit EKTB (sold separately). For extra safety and added convenience, this Genie garage door opener features an integrated battery backup. That battery backup will power the garage door opener for up to 50 cycles when the main power is out.