Cybus EarPod

EarPods were devices from a parallel universe, created by John Lumic. They could be used to read minds, control them, and add information into them (a daily joke, for example). They were used as the alternate universe's alternative to mobile phones. (DW: Rise of the Cybermen) EarPods were used to induce trance prior to "upgrading" of Humans into Cybermen. (DW: The Age of Steel)

When the Cybermen entered this universe, the earpeices of the Torchwood Institute - specifically, Torchwood 1 - allowed control in a similar way, paving the way for the Battle of Canary Wharf. Adeola Oshodi died as an indirect result of this. (DW: Army of Ghosts) During Their attempted conquest of earth in the 19th century the Cybermen made cruder versions of the Earpods ( most likely from the same materials used to create the Cybershades) in order to gain control of The four workhouse owners.

Trivia

 * On the parallel universe the Earpods could remove information from a subjcts brain by producing two metal prongs that met at the top of the head.
 * On the parallel Earth the Earpods took control of people by inducing a trance but on our Earth the Earpeices were drilled straight into the victims brain.

EarPods also exist as a source of private entertainment. (BFA: Cuddlesome)