f2 car bluetooth fm transmitter kit tf card mp3 player speaker 3.1a dual usb adapter wireless audio receiver pd charger

this device transmit signal by wireless method, no need to modify anything in car hands-car jut for the safety driving purpose. 1. we do not accept any refund without no reason. 2. we don't refund full if the partial items is damaged in delivery due to some objective matter. but we can accept a partial refund for compensating the damaged part. 3. if the product has quality problems, you can take pictures and vedio to us. when we confirm it , we will give you a satisfactory solution and refund you the damaged part.