The time switch of SUEVIA has been around for over 30 years. I have for 28 years running and am very satisfied. Today purchase I made for a neighbor, because they could not cope with the programming of its digital time. After a power failure the theater began. When Suevia determine riders who are pushed out one-or, the switching times. Operating distance 30 minutes. The current time is set Duch turning the ratchet. Necessary after power failure and at Summer Winterzeitumstellung.Mit the switch can be chosen three operating modes: A: The unit is switched on permanently. 0 = Off, device is permanently switched off. Auto: The device is in accordance with the programming on and off .. A simple and reliable device that fits into a standard switch box.