Teleport control

A teleport control was a device added to the Second Doctor's TARDIS with a Stattenheim remote control stored inside. It gave the Time Lords "dual control" over the TARDIS. When pointing out the new addition to Jamie, the Doctor shouted "You'd think I'd never flown a TARDIS solo before!" He promised Jamie that he would complain when their mission to talk to Dastari was over. He took the control disk from inside it. (TV: The Two Doctors)

According to one account, the changes of the TARDIS interior were temporarily due to linking it with the Stattenheim remote of a CIA member and synchronising it with Gallifrey (AUDIO: The Black Hole) According to another, they were installed at the same time the Celestial Intervention Agency gave the TARDIS a "complete overhaul" as a reward for the Doctor's good performance on their mission to defeat the Players in Napoleonic France, it was an addition the Doctor very much protested. (PROSE: World Game)