This transmitter unit doesn't come with an external power supply. It's a great choice for audio transmission.

To use this Williams Sound FM transmitter, first connect it to your audio source. Since it doesn't have an external power supply, you'll need to make sure to power it through an appropriate internal power source. When using, keep it in a dry and cool place to avoid overheating. For maintenance, clean the device regularly with a soft, dry cloth. Don't use harsh chemicals or abrasive materials. If you encounter any problems, contact our customer service team for help.