What do you call those things that you put in the back window of the car and then you programme messages?



Answers:
http://www.alpha-american.com/p-alpha-wi.

This web-site sells the, "LED Programmable Rear Window Signs", that you MAY be looking for.

Hope this helps :-)
Stupid
An eyesore
The witch Toy !! You get the fun of using it and the car behind gets an eyefull of your thoughts. Could be some fun if used properly. HA HA !!
they are called message boards, but type typing in led message boards.

try maplin they r quite good 4 things like that
they are called annoyance intensifiers, or road-rage catalysts.
Quagmire, they are called rolling led car signs

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