Elau SX-1 Position Controller.
This unit was available with several different options, and the "LENZE" badged version was white rather than the standard black.
It is a very robust unit, although spare parts are quite hard to come by now, with many components having become obsolete.
RL Controls can upload and interrogate the user code from these controllers using the manufacturers software and interface.
Please contact us if you require more assistance with this product.