Skylink Atoms AT-0611 &frac12; HPf Garage Door Opener. Motor Head Only. Does not include Rail Drive System or Safety Sensors Works with existing Skylink Rail Assembly Drive System (Chain and Belt) and Safety Sensors. Compatible with most existing T-Rail or Tubular-Rail Systems and Safety Sensors making it simple to upgrade your current opener Powerful DC motor provides extremely quiet operation. Built-in LED light for bright and long-lasting illumination Compatible with SkylinkNet Hub for Smartphone control (Model HU-100 sold separately), Backup Battery (Model BA-100 sold separately) and in-car garage door remote system Soft Start and Stop gradually accelerates to full speed and slows down before stopping to reduce vibration and maximize life of mechanical parts Complete Garage Door Opener kits including motor, safety sensors and rail system are also available (AN-1622K, AT-1611, AT-1622BK, AT-1722  SOLD SEPARATELY)