Different radios (and AP) have different connectors.
The normal way of connecting to them is by soldering/crimping necessary wires to the connector that plugs in to the radio.

So, for a normal installation you have to connect three (or four) wires to that connector. In the same way as you connect wires for headset, PTT, power etc. to the connector.

With Aviation Companion two alternatives are suggested:
1) Cut off the small connector and solder/crimp the wires to the radio’s connector. This gives an compact solution. If your radio has nothing else attached to the connector this is the way to go.
or
2) Solder/crimp the enclosed extension cable to radios connector and plug Aviation Companion in to the extension cable. This gives a solution where the Aviation Companion easily can be detached from not only the radio but also from the wiring harness too.

The small connector is carefully selected for small dimensions and low weight to match Aviation Companion.
The RS422 version comes with open wire ends or optionally with connector for Becker AR6201.