Kenwood Kna-g431 GPS Add-on Module - Blank No Maps
This add-on GPS module will work on most Kenwood models up to 2009.  2010 models start using a different unit, so it will not work with them.  It will also work on any international model, for example the DDX-514 in the US is the DDX-5024 in Europe and the DDX-5034 in Asia.  This specific model comes WITHOUT maps (that is why it says BLANK), but it does come with all the software in it.  All you need is to purchase maps for your region from Garmin or a distributor.  Make sure you get the maps in SD Card for