TOA's 9000M2 Series Amplifiers are designed to be used in conjunction with optional modules and can be configured for up to 8 inputs and 8 outputs. Usable modules include the following 9000 series plug-in modules: D-001T and D-001R (2-channel input), T-001T (Audio output expansion), C-001T (Control I/O expansion), ZP-001T (Zone paging), AN-001T (Ambient noise sensor), and RC-001T (Remote controller interface), as well as 900 series input modules. The most appropriate modules can be selected depending on applications.