The Extron AAP 424 is a four-gang size AV connectivity mounting frame with openings to accommodate two decorator-style modules or one dual decorator-style module, such as the Extron DTP HDMI 230 D, and up to four single-space AAPâ„¢ AV Connectivity Modules. The AAP 424 mounts directly to the wall, lectern, or other flat surface for convenient access to connectivity. It is also compatible with four-gang wall or surface mount boxes, such as the SMB 104 or EWB 104. Decorator-style and AAP modules are sold separately. Dimensions: 4.5" x 8.3" x 0.25" (11.43 x 21.08 x 0.64 cm).