This car Bluetooth audio receiver is made of plastic and metal, and features a 3.5mm interface and Bluetooth 5.0 technology. It is compatible with cars, headphones, mobile phones, and speakers. The product size is 5*2*1cm and weighs 11g. It comes with a 5cm USB charging cable, a manual, and is packaged in a sealing PP bag. The receiver supports connecting headphones, mobile phones, speakers, and cars, making it a convenient and versatile audio solution.