meant to imply that the Master constructed it on Earth, and it was deliberately made larger than the Doctor's sonic screwdriver. Like the Doctor's screwdriver and Sarah Jane's lipstick, the Master's laser screwdriver was also created as a children's toy with sound effects. The laser screwdriver reappears in The Doctor Falls when the Master encounters his later female incarnation, Missy. Again, his screwdriver acts as a weapon, the Master using it to destroy a Cyberman and to kill Missy, shooting her in the back after she stabbed him in the back. In the series 4 episode "Partners in Crime", the antagonist Miss Foster is shown using a sonic device identified as a sonic pen, which the Doctor describes as having identical functionality to his screwdriver. It could, however, open deadlocked windows and compartments in the Adipose building that the sonic screwdriver couldn't. After confiscating and briefly using it, the Doctor throws the sonic pen into a bin. The sonic pen took the form of a sleek, black and silver fountain pen with a blue light at the top and was made into a toy version which was paired with the sonic screwdriver. In "Silence in the Library", Professor River Song possesses a slightly bulkier sonic screwdriver, which she claims the Doctor gave to her in his future. The Doctor mentioned that he does not give his screwdriver to anyone. In the following episode, Professor Song mentions that her screwdriver is augmented with a "red setting" and "dampers". It also contains a hidden neural relay linked to River Song, saving her at the episode's conclusion—the purpose for which the future Doctor gave Professor Song the device. A toy version is available. It was revealed in "The Husbands of River Song" that it was the Twelfth Doctor who gave it to River. In "Journey's End", Sarah Jane Smith is seen using her own sonic screwdriver, or sonic lipstick to open a door on the Dalek Crucible. In the Christmas special The Next Doctor, Jackson Lake, who believes himself to be the Doctor, carries a regular screwdriver which he claims to be sonic. When the Doctor asks "How is it sonic?", Lake replies, "It makes a noise," which he demonstrates by tapping it against a door frame. In the series 6 episode "Let's Kill Hitler", the Doctor has a sonic cane which appears to have the same functions as the sonic screwdriver. In