A collector's dream! 
A Nintendo Game Boy compact video game system.
Transparent / clear / also known as X-ray in the UK
Released in 1995
UK release
The actual console is still in factory sealed wrapper.
The outer plastic box was opened to remove the batteries that were corroded.
Unfortunately, I can't test it to see if it works as it is sealed.

Play it Loud!

On March 20, 1995, Nintendo released several Game Boy models with colored cases, advertising them in the "Play It Loud!" campaign

(Japanese name: Game Boy Bros. /ゲームボーイブロス Gēmu Bōi Burosu/ゲームボーイブラザース Gēmu Bōi Burazāsu). Specifications for this unit remain exactly the same as the original Game Boy, including the monochromatic screen. This new line of coloured Game Boys would set a precedent for later Nintendo handhelds; every one of them since has been available in more than one colour. Play It Loud! units were manufactured in red, green, black, yellow, white, blue, and clear (transparent) or sometimes called X-Ray in the UK.