Here is an interesting device, about which not much is known (at least I couldn't find much about it). Anyways, in Japan, karaoke is very popular, and as such someone at Bandai thought this device would be a neat way to capitalize on its popularity. As to how well this device sold is not known. But it apparently is a lot of fun, just look at the face of the girl on the cover of the box :) Though this device really isn't all that cool in of itself, from a technical standpoint, it is rather neat IMO.

Like the Datech Barcode Battler and the Aladdin Deck Enhancer for the US NES, this uses its own special cartidges. Only one has been identified; i.e. I have a scan of the cart, and the ROM has been dumped. Vol 2. is listed in a ROM list but I have never seen it. If anyone has information on the other karaoke carts, or any other info on this, please contact me.

Some pics and info ripped from |tsr's NES Archive