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Chamberlain 3/4-HP Whisper Drive Belt Garage Door Opener with Battery Backup
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3/4 HPS belt drive system for the ultimate in quiet performance
Battery backup system will operate the garage door opener for 20 cycles within a 24-hour period and recharges automatically when the power comes back on
Auto force-sensing technology constantly monitors garage door opener system and adjusts forces to temperature fluctuations, floor height, and door track movement
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