Difference between V1 and V2/3

As I read in the Wiki, there’s not much difference between V1 and V2/3 (and that they are fully SW compatible). As I like the keypad of the V1 much better, I would like to get a V1.
Is there any significant difference, apart from the charging circuit? And what exactly is the difference there?
Does the V1 also have an audio jack for the freq. output? Unfortunately this is not described in the V1 Wiki.

I’m grateful for any answer.

The specifications between them are pretty much the same. So the difference between them is not easy tto find. But I can tell you that: Compare to DSO V1, We have upgrade the hardware in the DSO V2, especially charging unit.

Best Regards!