you can just Insert this item to the back radio

match your phone or pad to bluetooth module.and Choose Aux from your radio, then you can use your phone to play music through car speakers.

you can also just use aux in function to paly music

Condition:100% Brand new

Material:ABS Plastic

Include:1 x Bluetooth module radio stereo Aux cable adaptor

length: 150cm

Fits:

Mazda 3 Mazda 6 M3 M6 Pentium B70
Mazda 6 2006 to up ONLY
Mazda 3 2006 to up ONLY
Mazda 5 2006 to up ONLY
Mazda 2 2006 to up ONLY
Mazda MX5 2006 to up ONLY
Mazda RX8 2006 to up ONLY
(The AUX line in 2006 after the models and panel with the MEDAI key can be used.) the cable not fit 2005 before model.