Bluetooth MP3 player makes it so effecient to play music ,pick calls from phone,tablets or any bt compatible device and  means that drivers no longer have to fill their vehicles with numerous CDs when they want some in-car entertainment. A car MP3 modulator connects to the vehicle's stereo and is one of the best ways to play tracks from an MP3 device through the car's FM radio. Its easy to connect and conceal within the car. You also connect the phone via bluetooth meaning there is no need for cables. In addition you can play music from a MictoSD card as you charge your phone.Owning a Bluetooth MP3 player means that drivers no longer have to fill their vehicles with numerous CDs when they want some in-car entertainment. A car MP3 modulator connects to the vehicle's stereo and is one of the best ways to play tracks from an MP3 device through the car's FM radio. Its easy to connect and conceal within the car. You also connect the phone via bluetooth meaning there is no need for cables. In addition you can play music from a MictoSD card as you charge your phone.