I have an old car stereo - Pioneer DEH-2750MP - bought in 2005 and it is still working without any issues. It has only CD player input and no 3.5mm aux input nor Bluetooth input. I'm planning to add at least 3.5mm aux input.
I haven't unscrewed it from the car so I don't know how it's rear looks like. So I searched for the images on web and found some (see attached)
I read somewhere that the RCA jacks behind the player is called preout-rear. I don't know what does it mean. So I'm asking that can we connect a '3.5mm jack to RCA' to this RCA port? Or is there any way to attach a 3.5mm jack to this player?