The 9155023 is a 3 Module Surface-mount Frame for use in completing a 2N® Helios IP Verso™ Modular Door Intercom system. The 2N 9155023 3-Module Frame can be used with either a Verso™ Basic Main Unit + 1 additonal Module or with 3 x Additional Function Modules. Having chosen your Verso™ Basic Main Unit (Part Number 9155101 or 9155101C), you can choose from a range of Surface-mount for Flush-mount Frames, Back Boxes, Additonal Function and Accessories to create an easily self-assembled, professional grade Door Access Unit. This Frame is a component part of the 2N® Helios IP Verso™ Modular Door Entry range. Size: 107x361x28 mm.