A:AnswerIt adds no additional features other than playing the audio through your car speakers. In my experience, a phone call through the car audio system will have echos and be very poor quality. Your phone likely has hands-free built in by using your voice commands. Buy an bluetooth or wired ear piece if you want to make calls. This is strictly for playing music on an older car without an aux input jack.
A:AnswerThis adapter requires you to plug the 3.5mm jack into the device you want to play music from. If you are looking for a Bluetooth piece that would be our BTHFS380 cassette.