Electronic Limit: This Curtain Motors with electronic limit, no need to set the limit position by hand, it greatly shortens the debugging time. The electronic limit function can automatically delete the limit difference of each day and keep the precise limit position for a long time. Built-in radio receiver (Optional): Fox Domotics curtain motor is endowed with built-in receiver function, which is compatible with any other type of Fox Domotics emitters. Curtains can be controlled separately or in a group system. Resistance and stop function: When you use hand to pull the opening or closing curtain, the curtain will automatically stop if meet resistance. Light touch - start function: If use hand to pull the curtain lightly, the curtain will run automatically and stop until fully opened or fully closed. Power off - Manual Function: When the power is off, just do as we do to a common manual operated curtain, we can lightly pull the curtain to open and close.