The 1+n intercom system was developed to convert a classic doorbell system into a complete intercom system without the need to lay additional cables in the riser. The confidentiality of conversations between the individual residential units is maintained.Product features:Switching device for connecting 4 door stations Installation in electrical distributorsTechnical data:Compatible with system 1+nfor top hat rail mounting Width: 10 sub-units (180mm) Installation instructions:Note: