I’m sure their system will be expanded. For now Police, Fire, Engineering Maintenance, EMS-Environmental management service, and Transportation TG’s. I know nursing and urgent care also uses the radios sometimes.The signal reaches amazingly far. I'm on the DE/PA state line and I can get it on a handheld outside. Radio techs were there last Thursday trying to get the call boxes working. Lots of TG's not Id'ed yet aside from those posted.