I've never seen this, but looking at the kit, it is clearly a simple electronics construction kit. The kit makes a simple radio, a buzzer, maybe a simple electric piano.
Judging from what I can see on the website, you have lots of individual electronic components mounted in plastic packaging, and you mount the required components onto a special printed circuit board - the annotation on the board shows you which component is required. You then connect a battery (probably 9V) and bob's your uncle.
Is that adequate?