The texture is a matte textured feel. It is not super slick. They are a hard plastic and don't appear to have any sort of coating on them. I will say as hard plastic goes, they are not as hard as some other keyboards I have in my personal office. So if using your finger nails, your might be noticing the clickety clack, but compared to my to other older keyboards, your probably going to notice it is a duller than usual. The keys themselves are very quiet like that of a nice laptop with really good feedback. It definitely feels like a laptop experiencing for my desktop, which I am digging!

In the photo the bigger the keyboard, the louder the keys. The middle keyboard is an HP set that came with a desktop, it too has textured keys, but it is definitely a harder plastic. And the Logitech on the bottom is loud as can be and definitely has hard hallow sounding keys that would definitely give some extra sound when typing with fingernails.

So of the 3 three the Dell is definitely going to give you the best sound experience.

It is capable of connecting via the included USB receiver which makes compatible with just about computing device and it also has bluetooth connection for up to two devices, so as long as your device has a USB port or Bluetooth connectivity your are good to go.

You don't need a license or registration to fly the Mini Series drones. However, when drone is locked on to GPS there are areas that have restrictions. Some of those areas do require you to register and you can do so via the DJI Fly App.

Yes