821 TWO modular series: containers and modules

The 821 modular push-button panel for the TWO system (2-wire BUS): flush-mounting and wall-mounting boxes (from 2 to 6 modules), the audio/video or audio-only module in the first position, followed by push-buttons, keypad, tag reader, display with directory, and blank module for empty spaces. Boxes and modules for push-buttons, keypad, tag, display, and blank are also compatible with TDH and IP: only the main module changes. To configure it without errors, use the Ipertronic Configurator.