Honeywell Analytics 301-EM-RFSA-US3 Controller w/ Horn & Strobe Type 3 US, Gas Detection Network Expansion Module for 301C

Honeywell Analytics 301-EM-RFSA-US3 Controller w/ Horn & Strobe Type 3 US, Gas Detection Network Expansion Module for 301C. The Honeywell 301-EM Series Gas Detection Expansion Module are designed for specific refrigerant monitoring applications. They are directly compatible with the ECFX series.