The device in his hand, Raze recognized it in an instant. Because it was a communicator, which wasn't just any item but one that was used among the mages in his world.
It had the same design and the same markings as products made by Idore, one of the Supreme Magus who had great power in creating items of the highest caliber. The communicator was one of the lower-tier products but well-distributed because it had an additional effect.
The range of the item could be increased with one's mana. It could also be set to only react with the same type of device. Essentially, multiple organizations could have communicators and be in the same room, but they would only react with each other.
When mages made guilds, it was a good way for them to know who was on their side. This included when one would work as a double agent and spy. At times, mages had guild wars between each other.