This is a home-made serial control cable w/ integrated "exposing" LED. LED is Green when shutter is closed, and Red when shutter is open. This cable works with the 300D or 350D/XT and requires a serial port; I've used it with laptop serial ports and also USB/Serial adapters.

Whomever is the first to buy one of the Canon cameras listed elsewhere on the garage sale page will get this cable... only the first buyer will get a cable. (I only have one.)