Harry Bloomfield wrote:
After serious thinking David wrote :
Screen at the front is self contained and sits over the rear view mirror,
but powered by a lead to a 12v socket. Possible to use that lead as an
aerial (I have no idea if they do) but there is no obvious external
aerial.

Communication will probably one way. Camera only transmits the picture,
screen only receives the signal...

Not so if it's a WiFi connection using TCP/IP. There has to be a
'conversation' between the ends to establish communication.

--
Chris Green
·