Sonic lantern
From Tardis Wiki, the free Doctor Who reference
Sonic lanterns were small yellow devices used by the Silurians. They produced irritating noises which could be used to corral dinosaurs in place.
When a theropod dinosaur was accidentally brought to 1890s London, Lady Vastra gave the police force sonic lanterns to keep her from wandering off. While drifting in and out of his post-regeneration confusion, the Doctor claimed the sonic lanterns were giving the dinosaur headaches. (TV: Deep Breath)
