An automatic garage door can be a tremendously useful labour-saving device, allowing you to enter, exit and secure your garage door without ever leaving the comfort of your vehicle. However, garage door openers naturally require a power source to function, and many openers become useless if and when your home's main power supply cuts out, forcing you to revert to opening and closing your garage door by hand.
However, not all garage doors become immobile when the power cuts out, and not all garage door openers become completely inoperative without their main power supply.
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