The surface of the amplifier was blistered, but as part of the design and not the result of extreme heat or cold. It was criss-crossed with raised ribbons of metal, which broadened out at random intervals to encircle two buttons. At the broad end, it had three irregular holes. The narrower end of the amplifier was different in texture, like ceramic, but the same pastel colour. The amplifier was deep-lavender.
The inner circuitry produced an emotional amplification effect, capable of transmitting emotions including hunger, aggression, lust and rage. It contained a picture within the circuitry of the designer, although this was merely incidental to the primary function. There were also symbols incised into the circuitry. When turned on, it pulsed a colour of light which depended on the emotion it detected. For lust it pulsed amber and for anger it pulsed crimson.
The amplifier was part of a batch of pastel coloured metallic objects, some the size of paperback books and some the size of oranges. No two were identical, but they were all alike. One was ovoid in shape, some were long and thin, some were short and squat and some looked like globules all massed together. They varied in colour, from aquamarine to rose. (PROSE: Slow Decay)
Torchwood bought five as a job lot at an auction in South Wales in 1948. It was unknown from where they originally came. One even made it as far away as London, where it was archived by Torchwood One.