Lowest according to the 3 camels.
Bought this then returned it as I really didn't need it.
About this item
Accurate positioning with calibration method
4 Adapters included as standard for different bead cords
Easy installation for operation of roller blinds via the beaded cord
Two physical buttons for direct operation
Controllable by voice via HomeKit, Alexa, Google Assistant and IFTTT
The Aqara Roller Shade driver E1 requires an Aqara hub (sold separately) for the full experience
More information on the Aqara website.
Bought for $50 on eBay last year