I'm taking a stab in the dark, since I really haven't read the documentation.
the number like 40060 is amount of free ram, that changes based on what is running what you have loaded (I've noticed that go down as I load programs and run them so I'm pretty sure that is what it is)
the 7.3-8.4 numbers are the battery level (I've noticed that goes up slowly as I charge my battery pack, so I'm pretty sure that is what it is)
I large orange and grey buttons at the same time to turn the unit off, not sure if this is the recommended approach, but it seems to work every time.
Ships are safe inside the harbor.