Car Radio Advertising control device

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Job Description

I am looking for freelancers to help me build a device that can control the advertising played in cars. The device would be fixed to the radio. The device would would have a timer where every lapse of time it suspends the radio and plays a audio commercial. The device would have to tap into the car speakers.
The technology would have to be cheap because the aim is to use in third world countries.

If you are able to design and develop an electronic please contact me so we can go ahead with the specifics.

Best