Abstract: A motorized window treatment has a headrail, a first operable rail and a second operable rail, a driving device, a distance detection circuit, a receiving circuit and a motor control circuit. The motor control circuit is coupled with the receiving circuit and the distance detection circuit for configuring the driving device to move the first operable rail and the second operable rail according to the signals received by the receiving circuit. When the receiving circuit receives a command signal to move the second operable rail towards a target position and the first operable rail locates between the second operable rail and the target position, the motor control circuit configures the driving device to move the second operable rail and the first operable rail collectively towards the target position.

Abstract: A window covering system and a calibration method therefor are provided for generating a safe distance between a middle rail and a lower rail according to status of a first lifting cord. The calibration method includes moving the middle and lower rails upwardly until reaching their initial positions, moving down the lower rail a predetermined distance and storing the detected position thereof as a first position, moving down the middle rail until a switch transmits a first signal as the first lifting cord running through the switch becomes loose, moving up the middle rail until the switch stops transmitting the first signal as the first lifting cord becomes tense, storing the detected position of the middle rail as a second position, and generating the safe distance according to the first and the second positions such that the middle rail is prevented from being pushed by the lower rail.

Abstract: A method of controlling multiple electric window coverings includes the following steps: A. receive a check command, which is created from an electronic device operated by the user; B. compare battery levels of batteries of the electric window coverings to at least one power threshold; C. control the electric window coverings based on a comparison result obtained in the previous step, wherein, when the battery level of the battery of any one of the electric window coverings is greater than the power threshold, said electric window covering makes a first response; when the battery level of the battery of any one of the electric window coverings is less than the power threshold, said electric window covering makes a second response. Whereby, the user could learn the battery level of the battery of each of the electric window coverings from the response it makes.

Abstract: A motorized window treatment has a headrail, a first operable rail and a second operable rail, a driving device, a distance detection circuit, a receiving circuit and a motor control circuit. The motor control circuit is coupled with the receiving circuit and the distance detection circuit for configuring the driving device to move the first operable rail and the second operable rail according to the signals received by the receiving circuit. When the receiving circuit receives a command signal to move the second operable rail towards a target position and the first operable rail locates between the second operable rail and the target position, the motor control circuit configures the driving device to move the second operable rail and the first operable rail collectively towards the target position.