Military Issued communication Technology.

The military employs a variety of communication tools, such as the classic methods we are familiar with, for example Gmail, telephone conversations, text messaging, radios, and more. An issue occurred when soldiers who were required to remain unseen yet in plain view couldn't be outfitted with radios or earpieces that provided no alternative to making urgent calls in times of crisis.

A revolutionary advancement in technology made it possible for teams to easily communicate and send out emergency calls. This was done via a small and almost undetectable earpiece with a speaker, which was placed inside the mouth. The settings on this device could be customized, so multiple sets could be connected on the same line.
The speaker was incredibly sensitive, picking up the faintest of whispers and sounds in the vicinity of the soldier. Therefore, anyone talking to or near the soldier could be heard clearly when the device was turned on. The earpiece had noise canceling technology inbeded into it. When the earpiece was pressed three times in a row without a break it sent a distress call to all emergency responders in the area that were connected to the same group.
The soldier in charge of the technology could quickly rid themselves of it to avoid any potential for accidental activation or misuse, which could lead to disruption in the organization. If on duty the apparatus cannot be deactivated without notifying the headquarters regarding the justification and duration of the power down to guarantee security and understanding of who is on duty. The device could only be activated and deactivated through the use of a secure application so that it could not be done accidentally. 
It was distributed at the beginning in the Royal Guard as they were the ones that were out blending into crowds. Then it was given to all the other soldirs and it became the offical comunacation device around the active forces.