Hame's teleport bracelet

Novice Hame carried a teleport bracelet on New Earth in the year 5,000,000,053. She used it to teleport herself and the Tenth Doctor from the motorway to the New Earth Senate. This teleport caused discomfort for the Doctor, who refered to it as "rough". He asked Hame to go back and teleport the people out of there, starting with Martha Jones, only for Hame to reveal that she only had power for one trip. She was, however, able to use the bracelet to turn on the lights in the building. (TV: Gridlock)