Went to Goodwill to drop off some stuff but I made the mistake of walking in....

Saw this weird looking table top arcade thing by Konami:



Inside was an original Gameboy (sans battery lid). Ah, so it's a converter of some sort, I thought. Upon closer examination I saw that the joystick and buttons moves these plastic pieces to push the d pad and buttons on the GB. The screen is a magnifier with small light but I couldn't test it as the batteries were shot. So I take the chance, buy it and go home. Popped in some D batteries (for the unit) and AA batteries (for the GB) and gave it a whirl.

The unit also has a plug that goes into the headphone jack and then pumps the sound through a side speaker, kinda like an arcade game. There seem to be lights, but the didn't come on. A little tinkering showed that the screen was partially popped off and the lights are on a simple circuit. Put the screen back on right and let there be light!

I have never ever seen one of these things. Any idea on how rare this is?

Oh and does anyone have a spare battery lid I could buy?