I can live With those possibilities Finnspeed, what I was looking for was a system than could be like "put in and forget" , that was active when I armed the main battery and was off when I put the plane in the car .
Could not that time find what I was looking for so this has done its job so fare .
One intersting thing i that on the Jeti Mezon if the prop spinns you have Power to you RX if the main battery is out.....we have tried this a few time... in real life
But when I start to use the OS gir motor it a bit harder to spin than a Hacker Q80 so thats why I wanted a backup