Telepathic transmitter

A telepathic transmitter was a device which allowed an individual to communicate remotely with a Time Lord by linking the two's minds via that Time Lord's TARDIS.

The Twelfth Doctor gave a telepathic transmitter to Priyanka Maratha, who had to swallow the device for it to work. The Doctor then used it to help Priyanka pilot the Haven and prevent it from crash-landing. (COMIC: The Swords of Kali)