If you want to connect the high pass + navigation to the Seager jack

pu1. There's a 3-outlet multi-socket, so you can buy it and connect it.

2017-11-17

OK

pu2. You can use the 3-ball multi-socket that you mentioned. And A is better big. If it's low, it can be hard to charge or slow when you want to charge it.

2017-11-17

OK