Bosch D9127UThe Bosch D9127U POPIT Module (without tamper switch) provides point identification of initiating devices, and supervises wiring to devices for circuit integrity. For use when there is a need to expand a compatible control panel beyond its standard number of on board initiating zones or points. The D8125 Multiplex Zone Expander is required. The D9127 modules are wired in parallel on the D8125 data loop.