The LVC-III and LVC-S is for single station low voltage control. The LVC-III is used to control one 115V motor in one of three ways: Low voltage wall switch/dry contact, RF (radio frequency) or IR (infrared). Works with LVC-S, LVC-SL LED, WRT/R, IRT/R, SP-KSM, Aux. "dry" contacts and KS-1 Power Supply Switch. The MC1 and LVC-III may be built into Signature V & E. Factory installed controls will increase the length of the case. Call for exact case length is this dimension is critical.