Brand new keyboard/mouse adaptor for Dreamcast.
This allows you to use a standard 'ps/2'(most common, smaller, plug type) computer keyboard or mouse.
Supports middle mouse button & scroll wheel!

Just plug adaptor into Dreamcast controller socket, & plug keyboard or mouse into the adaptor.
See photos. Keyboard, Mouse & Dreamcast shown for illustrative purposes only, they are not included in the price.

Great for web browsing & email, much easier & faster than using a joypad.
Can be used at the same time as normal pads - eg: use joypad as pointer in browser, & keyboard to enter text.

Also great for games like:
Quake III, Half-Life, Typing of the Dead(like House of the Dead, but typing on keyboard instead of a light gun!) & any other games that support keyboard or mouse.

Adaptor has 1 socket, so if you wanted to use a keyboard & mouse at the same time you'd need 2 adaptors.
Works with any game/program that supports a keyboard or mouse.

NOTE:
Half-Life: Blue Shift for Dreamcast was never officially released, but it has been leaked on the internet(apparently by one of the developers) - it's available through peer-to-peer programs like Kazaa etc. It works fine, the developers only didn't release it supposedly because of some odd tax break they could get by not releasing it.