... anti-jamming ability. 3.Low voice :motor and the track system make low noise,runs stable. 4.No need to ... Big torque:use the big torque AC motor with gear,running steadily quiet,MAX pull power is 12KG,can be ... function of stop-on-resistance ,protect the whole system,safety running. 8.Both electronic control and handing pulling,hand pulling ... Chamber in Zhuhai and so on. Electric roller curtain track