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The sonic cane was a sonic device used by the Eleventh Doctor while his regular sonic screwdriver was indisposed. He used it to scan the Teselecta and, having given his screwdriver to them, to contact Amy Pond and Rory Williams through the two sonic devices while they were miniaturised inside.
Similar to the Eleventh Doctor's sonic screwdriver, the sonic cane emitted a green light and featured four "claws" which popped outwards to reveal the green light. It also recognised a signal from the sonic screwdriver. (TV: Let's Kill Hitler)
Behind the scenes
The sonic cane was made into a DWMI Card in September 2011.