Nice find. If it's an official product, I haven't seen one of those yet. It's a telephone cord with a coupler on one end so you can extend the length of your existing telephone cord.
Thanks for the info. It just seemed too simple to me. What about using a longer telephone cable? Anyway, it's an official product of Sega of Japan, Serial: HKT-8200 Shots from Yahoo Auctions Japan.
