Questions about Sphero Mini

It always happens with such products that certain colour variants are more expensive than others because the demand is different.

I had a look in the App Store. The app seems to be available in 11 languages but not in Russian. I bought the toy for myself (50 years old). It's kind of fun at first but I soon lost interest. I don't know how children see it but I wouldn't recommend buying it. I think children should have something to do with their hands. This is my personal opinion

Excuse me, I don't know, it's a gift for someone else. Bought without knobs. Lg