Stenza recall device

A Stenza recall device is a teleportation device included in a Stenza transport pod designed to teleport the pod's user back to the Stenza Homeworld.

History
When wanna-be Stenza leader Tim Shaw came to Earth to hunt Karl, the newly-regenerated Thirteenth Doctor found the recall device in his pod. The Doctor took the device with her into a confrontation with Tim Shaw on top of a crane where the Doctor threatened to destroy the device and strand Tim Shaw on Earth. The Doctor offered Tim Shaw the choice of using the recall device to go home or being stranded forever. Tim Shaw instead detonated the DNA bombs his Gathering coil had planted in the Doctor and her friends, but discovered too late that the Doctor had transferred them into the coil and through the coil into Tim Shaw. The Doctor tossed Tim Shaw the recall device and as Karl kicked the Stenza off the crane, he activated it and teleported away. (TV: The Woman Who Fell to Earth)

However, the recall device did not take Tim Shaw home, having been corrupted by the Doctor. Instead, Tim Shaw was teleported to Ranskoor Av Kolos, near death from the effects of the DNA bombs. Tim Shaw was left stranded on the planet, unable to leave without dying. (TV: The Battle of Ranskoor Av Kolos)