Not sure on proper techincal specs but tbh I bought them purely for asthetics.
At full 12v they are a lil noisy for my taste but then again i'm a bit of a silence freak, they strike a happy medium down at 9v though.
Na I think it was just a product sample we got sent over from Germany a couple of months back, been sat on the shelves gathering dust for a while so I thought i'd put them to good use.
They feel really well made, it's just a massive slab of acrylic! :D

