digital zoom. 

didn't come with external microphone but in my experience it is not necessary. I think they fixed the low mic volume problem. sound seems fine on my videos including ambient sounds. i did get a strange crackling noise maybe from vibration the internal picked up that the external mic did not when i used the internal mic on a bike ride. it was just fine in the car though 

For camera with telephoto zoom lens, you need to buy a tripod mount ring additionally or telephoto lens bracket for better balance) 

The adapter will mount the lens and you will be able to use it manually. However, my copy of the adapter does not allow the lens to be fully mounted all the way until it clicks into place. It doesn't quite make it, but it's still very solidly mounted. Also, the manual aperture linkage doesn't work properly (on my copy, at least) so exposure is controlled only by shutter speed and/or ISO. You will be able to manually focus and zoom the lens but no VR, of course. It will be a frustrating experience. Instead, get a 14-140 Panasonic zoom if you can afford it! 

Yes, 4x zoom.