Audiovisual Bidirectional Communication Probe

The Audiovisual Bidirection Communication Probe is a piece of electronic machinery created by Kirito to allow Yui to interact with the real world. Under the request of Asuna, it is later used by Yuuki to allow her to attend school.

It is primarily a communication device.

Functioning
It is shoulder-mounted camera that is connected to a cellphone to make use of the wireless internet and connect to a virtual space in which Yui and Yukki were.