Isocomm (i•so•com) is a communication device that can be used at great distances, light years apart. Only two parties can use this means of communication at a time, each having a box designated for transmission and reception. When initial communication is started, a light on the box flashes red. Upon successfully reaching the box on the other end, it turns to a solid orange. Once the recipient opens the call for the communication, the light will turn green on the sender's box. On the recipient's box, the light flashes green as the signal is received and turns solid when the connection is made. Though this is a secure form of communication, the greater the distance between the two boxes, the longer the delay in communication.
[Minor Spoiler] Only one of these devices is known to exist, and it is used by Kyd Lumin and Kered Lumin.