This unit does not come with an external power supply. Before buying, make sure to check your country's wireless frequency regulations as some frequency ranges may be illegal in certain countries. It has only undergone power - testing.

Using this Shure UA844SWB antenna distribution system is straightforward. First, since it doesn't have a power supply, you'll need to connect it to a suitable power source yourself. Before you start using it, always double - check your country's wireless frequency laws to avoid any legal issues. When it comes to maintenance, keep it in a dry and clean place. If you notice any problems, have it checked by a professional. Also, remember that this unit has only been power - tested, so handle it with care during initial use.