ZSTARR motorized track, customize your own motorized track for smart living. Suitable for straight windows as well as curved windows. Open and close the window curtain by RF remote control, stop at any prefers position via remote. Over loading protection, it can be operated by hand while power off. Installation is very easy for everyone. Smart limit detection by saving the open and close positions. Automatic stop in seconds when the curtain is fully opened or closed. Suitable for straight windows as well as curved windows Great for replacement of traditional curtain/drapery tracks/rails. You can even re-use your existing curtains.