VARILIGHT 1-10V dimmers are 1- or 2-way and can be controlled 2-way with a standard switch. It is designed to work with 1 or multiple ballasts/drivers up to 20mA.
These types of dimmers require an extra two cores of cable as the dimming and switching functions are separate. The switching side is wired as a conventional switch to the mains and the dimming side is connected via the extra two core cable to the positive and negative terminals on the dimmable ballast/LED driver. Please see the wiring diagram for more information.