It's a hybrid camera.
So you don't need, if necessary, batteries.

It will be a camera that wil not give any problem in the next 30 years. Very solid!

The advantage of the Leica M7 is the silent shutter.
When you take an image with a FM3A in an museum for exemple, you have the impression that every one is regarding the photographer.

But don't hesitate to buy a FM3A, and afterwards, when budget is not a problem anymore, give it to your daughter and offer you yourself the Leica.
That's what I did here.

Fred