Ltpgtltspan stylequotcolor ff0000quotgtslave unit ampndash this requires a master switch in the same circuit to function so is only for use in two way or multi way circuits used in conjunction with a v pro master switch this will not function as a standalone dimmerltspangtltspan stylequotcolor ff0000quotgtltspangtltpgtltpgtthe varilight v pro series comprises programmable intelligent dimmers with a choice of dimming modes for wider compatibi