The Chamberlain Quick-Release Key allows exterior operation of the garage door in case of a power failure. It is designed for vault-style garages without entry doors and is for use on metal or wood doors only. Two keys are included as an added convenience. All of the necessary mounting hardware is included allowing the product to be installed the same day that it is received. This garage door opener key is equipped with a weather-resistant aluminum faceplate for added durability. Enable quick and easy access to your garage even during a power failure with this simple garage key.