The LiftMaster alternative power system, offered by Door Doctor, allows to install the current wherever you wish. The system offers a flexibility and a convenience allowing you to connect your devices when a power outlet is not available within 6 feet. The power system offers the possibility to work without the presence of an electrician with its easy and effective installation. UL approved. The LiftMaster models are compatible with the Door Doctor operators and garage door accessories, and ensure you an outstanding reliability. Choose the alternative power sytem to ensure your back.