Insteon 2452-422 Home Automation DIN Rail Dimmer for Apple and Android devices is a module that clips right onto a DIN rail to add a wide variety of customizable, remotely controllable dimmer options (brightness levels, ramp rates) to multiple lights. If your application already utilizes home-run wiring with a central DIN Rail-equipped electrical closet, adding DIN Rail modules make it easy to add INSTEON control to hard-wired loads. The DIN Rail module includes sense wiring that can be configured to respond to latching, single-momentary and dual-momentary switches so that control from your existing wall switch can be preserved. If planning the electrical wiring for a new home or business, you can avoid adding too many wall switches in a single location. Wall switches ganged together can cause confusion and can quickly ruin the aesthetic of a room.