Smart automatic gate opener. The MM371W automatic dual gate opener brings unrivaled convenience with smart features that allow control from anywhere using your smart phone app and with the purchase of the Mighty Mule MMS100 Wireless Connectivity Kit (sold separately). Designed for medium-duty dual swing gates up to a maximum of 16-feet long or maximum weight of 550 pounds. Ideal for the Do It Yourself property owner with helpful tools such as online how-to videos and unlimited access to 24-hour technical support are available for a successful installation.