Allows hands-free calling from your Bluetooth enabled smartphone over the latest 5.0 technology. Car FM Transmitter Adapter: Wirelessly stream music from the FM adapter to your vehicles stereo system. Built-In Fast Charger and Controls: Charge two mobile devices with the 20-Watt USB-C PD charging port and 12W USB-A port; Get unlimited transmitting hours from a 12V charging port; Maintains volume and voice control.