KS aka KIND SHOCK / Kind shock dropper seatpost.
Since the height is adjusted with the rail mount lever, there is no need to manage the remote cable, and it is very easy to replace it with another bike.
Unusual among dropper posts, it has a size setting of 27.2 mm, so it can be attached to a steel frame or a gravel bike.
Seatpost diameter: 27.2mm
Travel amount: 100, 65mm
Seatpost length: 410, 305mm
Dropper operation: Rail mount lever type