So this a new take on the dear old training wheels, which are a pain to work with *), this is called Gyrowheel Gyroscopic Bicycle Wheel. I will let the video below explain how it work as it would be easier than me rambling on here.
I wonder how it is to ride with when you have learned how to cycle, as I’m sure that it will be working somewhat against your riding.
*) Please if you want to teach you child how to cycle don’t get them training wheel or stabilisers. First of all it takes longer for the child to learn how to cycle and it makes our (cycling instructors) life harder. Get a something like the “like-a-bike” and let your child play around on that for a few days before letting them have a go on a bicycle, you will be amazed how fast your child will up and running.