The 12V interface switch is a switcher based on a relay that drives the opening and the closing of the projector lifts (PPL 2035, PPL 2035-120V, PPL 2100, PPL 2100-120V, PPL 2170 and PPL 2170-120V). It can be used with video-projectors, amplifiers or home theatre decoders that have an output of 12 Volt DC.
If you install a 12 Volt interface you cannot use neither a remote control nor a switcher in order to switch on/off the projector lift.