A:AnswerYou can use the original Apple pencil. With the case closed on the iPad, the pencil will magnetically stick to the cover quite well. I use it with a soft case that holds the iPad, the cover and pencil all in one. works well.
A:AnswerYes, it is comfortable for long periods of use. I have large hands and often work on longer documents on my iPad Pro while I am traveling and am very glad that I got the Apple Smart Keyboard - I've tried other keyboards and they don't seem to work out great for long periods of use. This keyboard is very thin, doesn't add bulk to the iPad, and doesn't add strain when you use it.
A:AnswerIt has a magnetics ports (for lack of a better word) on the keyboard that connects the keyboard to the iPad. The keyboard uses the iPads battery
A:AnswerYes it is. It works perfectly with the iPad Air 3. My only complaint is that if you have to VPN, into a PC network the delete key doesn't work properly and I haven't attempted a work around for it. Hope this helps.