Bi-Directional Amplification For first responders, protection of lives and property depends on reliable in-building two-way communications. Honeywell offers the first and only all-inclusive, turnkey, NFPA-compliant and UL 2524 listed Class B BDA / ERCES System on the market which meets and exceeds NFPA / IFC specifications. For more information, visit https://hwll.co/BDA THE FUTURE IS WHAT WE MAKE IThttps://www.hwll.co/BDA https://www.hwll.co/BDA