A 2-way light switch is the most common control used for switching a light on and off. A 2-way light switch can be used on its own or in combination with another switch, giving you two sperate locations from which you can control a light. If you want to control a light from three locations, you will need an intermediate or 3-way switch.This White RM Module from the is compatible with both our RM and Dual (RM+CM) Grid Plates. With these you can create a wide range of bespoke plates such as dimmer and rocker switch combinations, to fulfil almost every imaginable lighting or isolation switch need for your home. This RM module is not compatible with CM, EM, LT1, LT2 or LT3 Plates.