The initial 1963 versions were made from ultra-fine 3-D knit iron alloy, powered by flat linear armature DC motors (rechargeable via any electrical outlet), short-wave radio (even a rotary phone was used once), collapsible roller skates. Most functions were controlled by miniature electronic switches mounted on the insides of various pieces; by pressing various combinations of them (using even the tongue), different systems were engaged.
The modern version is almost unrecognizable when compared to that.
Actually it looks almost exactly the same.
What is being talked about here?