Frequency-modulated acoustic lock
From Tardis Wiki, the free Doctor Who reference
{k t{Infobox Object |image = |aka = |type = Lock |origin = Unknown |made by = Unknown |used by = Sun-singers of Akhet |first = |only = |appearances = The Frequency-Modulated Acoustic Lock was a device that appeared in The Rings of Akhaten. It was presumably a lock that could be unlocked by a sonic frequency, although a constantly changing one as a security measure.
Frequency-Modulated acoustic lock
