It's basically an attachment on the bottom of a Sega Dreamcast (that you 
can get for dirt cheap anywhere), where you can hook in a couple of Karaoke 
Box style mics, then hook it into your phone line and have access to the 
entire SegaKara service like having their entire Karaoke Box catalog 
available to you without having to leave the house...and they have a 
boatload of English songs too.  You can get a month's worth of service for 
2000 yen or one day for 800.  Great party piece, especially as an 
icebreaker when Japanese and Gaigin are mingling.  You can probably pick 
both the DC and SegaKara on a Japanese auction page for about 2,000 yen.

-- 
He was here before Christ, before civilisation. He was king here! Rawhead, 
that's what they called him! RAWHEAD! Get upstairs, fuckface - I can't keep 
god waiting!
-Father Declan O'Brien, Clive Barker's Rawhead Rex

I have created an empire out of greasy burgers and flat soft drinks. And 
you are just...what's the word?  Ahhh yes! A "Sucka"!
- Ronald McDonald speaking to Mr. T