ClareVue accessory neutral switch works with a master neutral switch in situations where more than one switch controls the same light. This is commonly referred to as a 3- or 4-way lighting design. Start with one master neutral switch and replace all the other control points with a accessory neutral switch to complete your 3-way installation. Master switches and accessory switches use standard 120 VAC 60Hz house wiring and fit into standard lighting wall boxes. Standard electrical knowledge is required for installation. Switches will need to be paired to your smart home control hub before you can begin to control your lights from the Clare Home app.