When I receive it, I will open the plastic cover and see. I will also take photograph of internals and post here.
Please see these two posts:
https://discussions.flightaware.com/t/does-anyone-monitor-ais-ship-and-vessel-tracking/53634/249
https://discussions.flightaware.com/t/does-anyone-monitor-ais-ship-and-vessel-tracking/53634/250