Get Behind The Shield With The Armor All™ Bluetooth FM Transmitter with Dual USB Charging Ports. This device allows you to stream music from your Bluetooth enabled device, such as a smartphone, to your cars stereo system without the need for wires or professional installations. Plug this transmitter directly into your car’s 12V port and sync with your phone to stream wirelessly. This device also comes with two built-in USB charging ports so you can charge two devices simultaneously while you stream your music. The transmitter can also answer calls and utilizes a built-in microphone for hands free talking.