This transmitter unit doesn't come with an external power supply.

Using this Williams Sound PPA T45 NET D FM Transmitter with Dante is easy. First, make sure you have your own suitable power source as it doesn't include a power supply. Connect it to your audio source and set up the frequency according to your needs. When using, keep it in a dry and cool place. Don't expose it to extreme temperatures or humidity. For maintenance, clean the exterior regularly with a soft, dry cloth. Avoid using harsh chemicals. If you notice any problems, check the connections first before seeking further technical help.