the sound sensor is http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200468405003&ssPageName=STRK:MEWNX:IT
the sensor shield is http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200472010972&ssPageName=STRK:MEWNX:IT
I have connected the sensor in the upper left sensor input.