The e:bus input module integrates standard mechanical switching contacts into the e:bus protocol and into the e:cue system. It connects to the Butler XT via a standard e:bus interface and is powered via e:bus. An additional light/motion sensor interface extends the range of capabilities of the e:bus input module. A Locator LED in each unit makes it easy to identify modules by sending an according e:bus command to a module. Key presses on the switching contacts are sent over the e:bus as standard key messages.