Frame for installation on the surface 2 modules. No other accessories are needed for surface installation of the intercom. When installing on a glass or uneven surface we recommend you use a backplate_x005F_x000D_ 2 Module Surface-mount Frame for use in completing a AXIS IP Verso Modular Door Intercom system. The AXIS 9155022B 2-Module Frame can be used with either a Verso Basic Main Unit or with 2x Additional Function Modules._x005F_x000D_ _x005F_x000D_ 2 Module_x005F_x000D_ Suitable for IP Verso LTE Verso_x005F_x000D_ Accepts 2x Verso Additional Function Modules_x005F_x000D_ Finished in Brushed Steel_x005F_x000D_ Stylish robust Modular Door Intercom system component_x005F_x000D_