This unit comes without an external power supply.

This Williams Sound PPA T45 NET D FM Transmitter with Dante is a great device. When using it, make sure to connect it to your audio source properly. Since it doesn't come with a power supply, you'll need to use your own compatible power adapter. Avoid exposing it to extreme temperatures or moisture. For maintenance, keep it clean by gently wiping it with a soft, dry cloth. If you have any issues, check the connections first. Enjoy using this transmitter for your audio needs!