One circuit board as pictured, which is a Whelen Cencom traffic advisor control module (no wiring included). If you currently have a Cencom siren system and it does not have traffic advisor functionality installed, this circuit board can be installed into your amplifier to add that functionality. It is considered an upgrade when buying the system brand new and plug and play into the amplifier (you will need to get the wiring from Whelen or wire it yourself).
The board is like-new, tested, and works perfectly.