The motion sensor (MBD) is designed for automatic light control in rooms that are used sporadically, e.g. classrooms, meeting rooms, gyms, sports halls, stockrooms, laundry rooms, corridors, stores, etc., for greater convenience and to save electricity.
MBD has an adjustable turn-off time (how long the power/light remains on after the last detected movement) of 2 seconds to 2 hours.
The MBD-S version also has an On/Off/Auto button for rooms where the option of controlling the light manually as well as automatically is wanted.