On Fri, 23 Sep 2016 23:09:29 -0400, John Albert
wrote:

On 9/23/16 5:51 AM, wrote:
But what about car radios that have a CD player. Is there a similar
device that can be pushed into the CD opening to allow another audio
source to be played, such as a MP3 player?

Depends on the vehicle, but most newer cars have at least
one of the following:
- Auxilliary input jack
- Bluetooth
- USB port.
It is a 2004 Corolla which had neither on the base system