Steve Watkin wrote:
Any one got any knowledge of these?

I've not seen these, but...

"Why was it not invented before?"

AIUI, it's basically the same principle behind the Schmidt SON, so
clearly it has been "invented before". And the Schmidt has a lot more
magnets. Although this product is obviously a fraction of the price.

Also...

"* LED Light Emitting Diodes - Goodbye Batteries use Super Bright
LEDS with High Luminous Intensity, Wide Viewing Angles and Crystal
Clear Lens"

Sounds a bit vague. Where's the full technical spec?

d.