F-500 AC Sliding Gate Opener Features Supports Door weight from 800kg upto 1600kg Timely resistance detection , automatic reverse when obstacles are met Powerful AC motor with low noise and overheat protection. Remote Control Design High quality and heavy duty. Extra durable. F-550M DC Sliding Gate Opener Features Supports Door weight from 600kg upto 900kg Soft start and soft stop Powerful DC motor with low noise and overheat protection. Remote Control Selectable installation direction(Left / Right). Design High quality and heavy duty. Extra durable.