Tom,
is this the brand...?
http://www.engelaustralia.com.au/2pr...roductid=21612
This is the UK distributor
http://www.mps-trading.co.uk
12v dc s 12v dc.
What does need checking is if the units consumption is greater than car supply can handle. Your cars owners manual has the 12v supply sockets max ampage listed.
There should be a sticker/plate on the unit and the manufacturers web site gives the figures for each of its units.
I'd be interested to hear how you get on with it. Which model is it?