The Liftmaster 8550W is a premium belt-drive operator combining reliability and advanced features. The DC motor makes this operator one of the quietest options available.It also comes with a built-in WiFi module that allows it to be controlled and monitored from anywhere with the secure MyQ technology. A battery backup gives the 8550W the ability to operate even in the event of a power outage. There is a lifetime warranty on the motor and a 5yr. manufacturer’s warranty on all parts. For more information click the link to the manufacturer’s website.