Headjack (Earth-5125)

Headjacks are small data ports created on synthetically-grown humans to be connected to the Matrix in the power plants. They are irremovable, and thus redpills who escaped the Matrix have to carry them for the rest of their lives.

History
Headjacks are located at the skull's base, above the meeting of the head's back. They have 1 inch of diameter, and grant space to the human cranium's close quarters for data probes reaching 8 inches and 20 mm.

Headjack communication is a mixture of electromagnetic transmission, with the headjack as the central neural interface. When a human awakens from the power plants, thus becoming a redpill, they are met by a Docbot, which brutally removes the connection from the headjack port and flush the "undesirable" into a nexus of sewers.