This earbuds fit with any device with 3.5mm jack, devices without a 3.5mm jack, like the iPhone 7, 8, X, require an adapter.

Yes, these earbuds would work for small ears, they come with 3 different size replacement attachments.

As long as it has a 3.5MM jack. The plug is a universal size. They fit with phones, MP3 players, tablets, etc.

The jack is straight.

There is no physical volume control on these headphones, but have a call button with microphone for answer/reject calls, next song, previous song.

Yes, nice soft silicone eartips will will form a seal around your ear and you will be able to isolate and block some external noise better.