Connectable with external strong current switch: In the majority of hotel projects, normally the customer requires to use the strong switch of one brand to control lighting and electric window curtains. Four-core cable led by standard curtain tubular motor has the ability to connect with strong current switch or central control system. Also it is available to externally connect with strong current switch of any other brands. Electronic Limit: This motor 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. Resistance and stop function: When you use hand to pull the opening or closing curtain, the curtain will automatically stop if meet resistance. Power on and 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.