Vehicle Window LED Strobe Light
You could mount two of these in your back windshield. The possibilities are endless. Just be careful not to get in trouble :)
It isn't as bright as a real cop strobe, but it still gives a nice effect, for about 1/10th of the cost.
Press the red button to turn it on, and cycle through the flash modes.
Customer questions & answers
You may consider simply purchasing two units and modifying them yourself to make a single red one.
Jordan Moddes from Kenosha, WI
This is SUPER cool. its extremely bright from dusk to dawn and it COULD get you in a LOTTA trouble if not used properly. Already was questioned by officers. O.o
but to make a 'real' squad car look, 2 are needed and placed right next to each other. turn them on together and there you go. real looking police car. :)
really easy to install and all the wiring is simple too. :)