It is a noblest indoor blinds. We use DC motor for small window. Up& down by pulling the rope according to readjust the tape roll support on the device. To use DC source, there is little noise and the function is steady and reliance. The special localizer device lead different products to up and down precisely. The motor will power off automatically when the motor doesn't work. We use AC motor when it is big window. The two driver systems can use radio remote control, infrared control and brainpower control.