The Velbus VMB6IN has 6 separate inputs designed to be connect to push buttons, door or window contacts, movement detectors relay contacts, open collector outputs to the Velbus Home Automation System. The contacts can be located a long distance from the module. Each channel has an LED indicator which gives you the channel response time for the contact or switch setting. Four modes are available indicated by a very fast blinking LED 65ms, fast blinking 1s, slow blinking 2s and continuously on 3s