VEVOR Automatic Curtain Opener, 2 Pack, APP and Remote Control, Hub Included, Electric Smart Curtain Opener Compatible with Alexa and Google Home, Timed Opening and Closing, for Roman Rods, U/I Rails

The machine can be charged when it runs out of power.

This depends on whether your curtains are single or double panels. A single unit (one curtain motor) is suitable for single-pane curtains. A double unit (one pair of curtain motors) is suitable for double-pane curtains. A single unit option is also available in this product selection.