This voltage regulator is suitable for large fixed wing models.
In contains 2 input terminals (JR) to connect 2 batteries and it has 2 output terminals (JR) which need to be connected with the receiver.
The module contains 3 input wires and 2 output wires.
All 3 input wires are the same and can be interchanged freely. The 2 outputs are also the same and must be connected to the receiver.
See the manual of the Miracle Switch for more information: MiracleSwitch-Manual