HWD
You have to read the posts. This was concern I had, and I have commented on this aspect in my last post.
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In short the baby PCAS is really easy to move between aircraft with its totally self contained batteries and good battery life (over five hours), and sticky pad to fix it somewhere convenient. It is also really tiny.
The larger unit requires external power. That means if the aircraft does not have a cigarette lighter socket you have to rig up an alternative power source. Zaon sell an external battery for the purpose and you could rig your own with a bit of inginuity.