It broke from the first day. The buttons broke and you can't change the channels. Money wasted

Completely useless!!!
It doesn't work at all, neither for mp3 nor for connecting the phone!
Waste of money ☹

I bought the product yesterday and immediately tried it in my car. What interested me the most was the call quality when someone calls me or when I make a call on my mobile phone. In a test conversation, the person I was talking to couldn't hear me at all, even though I was shouting. The microphone is located on the device, and the device is connected to the car's power supply, which in some cars can be 80-100 centimeters away from the driver. Additionally, this particular device was transmitting on 87.5MHz on FM, but I couldn't change the frequency in any way, so I consider it defective and will return it. Otherwise, when there were no interferences from any station on 87.5, the sound sent from the mobile phone via Bluetooth was satisfactory, but not crystal clear.