Plasma Ball educational toy (Skerton LA1)

Plasma Ball educational toy with ca. 5" globe. Comes with original transformer putting out 12v / 1000mA into the Tesla Coil at the centre
See https://www.amazon.co.uk/Cliplanyard-Sensitive-Educational-Science-Novelty/... for something very similar.
Fun to watch - the electrical arc tendrils constantly move around the inside of the globe and strengthen when you touch the outside of the globe. Safe in normal use - can confirm there is no sensation to your fingers, even though electrons are coming through.
Here is a really good explanation of the physics involved https://www.youtube.com/watch?v=w7dvJj5gB4g
and experiments that you can do with it https://www.youtube.com/watch?v=_By0w9TfkAE [Parents note the safety advice in this video]