Chamberlain 3/4 hp Whisper Drive Plus Garage Door Opener w/Battery Back-Up, Belt Drive

3/4HPS* - The same lifting force specifications as 3/4AC Chamberlain garage door openers.Reinforced with flexible steel cordsBattery back-up opens door even when power goes outMVIS (Motor Vibration Isolation System) allows for super-quiet operation5-piece rail system provides faster, easier installation200 watts of lightingLifetime warranty on motorWireless keyless entry systemLock feature can be turned on to prevent operation of door by handheld remotes3-button remote can control opener lightsProtector System stops & reverses door if an obstruction breaks its light beam