Typically, these devices consist of a small box containing a Bluetooth radio and other electronics and a cable or wires that you plug into the head unit of your car.
Ngwaọrụ ndị a na-agụnye obere igbe nwere redio Bluetooth na ngwá electronic ndị ọzọ na waya ma ọ bụ wires ị na-agbanye n'ime isi ụgbọ ala gị.