The product is nice to look at, but contact between the cubes is done by the plastic edges painted with weakly conductive paint and these are the edges that are used to transmit electricity from point to point to other cubes => each cube is added the intensity of the light of all fall due both to poor electrical contact and the multiplication of the LEDs. It was a good idea at the base but the realization is not up to scratch, we find the low cost Chinese design! FYI: this is not induction, it is essential contact between the cubes so that they light up one hand and in addition there is a sense to position otherwise no light !! This is due to the use of LEDs which are polarized ... The transformer comes with this model is the Anglo-Saxon norm ... it's hilarious yet it feels like the 18th century. An adapter is no more than 3 euros, what a ridiculous economy. Long live China!
