Dave
The manufacturer says 6V max for both. CARF used a Powerbox Sensor switch to power the radio and the retracts are fed off that as the current is really low.
The 4 pins of the black unit go to the brakes. Polarity doesn’t matter.
The red gear controller has the 3 gear outputs marked. It doesn’t matter which is which, but I think the center one is meant to be nose gear.
Both controllers can be installed so that the connectors from the wing can be plugged directly into the units without an additional connector in between.
Dave