Its an electrical auto dim - dip rear view mirror which goes dark at night if some sod is blinding you from behind ,real nice touch and no escorts have these fitted But my GTI did as you can see in the picture hooks up with a couple of wires into your interior light or electric sunroof (as I did) dead easy and a touch of class,can be adapted to any car if you obtain a screen mirror boss but for mk1-2 focus owners it simply slides on
these cost a small fortune to buy new well over £140 so £50 posted is a snip, paypal accepted and is on ebay for £50 + postage
http://cgi.ebay.co.uk/ws/eBayISAPI.d...STRK:MESELX:IT
07928 502090