139250 is a programmable pre-set control panel to adjust the height.
It is an optional accessory for the following desk frames:
501-15, 501-17, 501-19, 501-25, 501-27, 501-29, 501-33,
501-43 and 501-49.
The programmable control panel offers the possibility of three individual users to program their own height settings and even with up to three individual height settings per. user.
At any time you can use the UP/DOWN buttons to adjust the height of the table without affecting the programmed heights.