Hands charging up a ring-pull mobile telephone

Hands charging up a ring-pull mobile telephone

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This image is part of the feature Ring Pull Mobile

Credit: VOLKER STEGER/SCIENCE PHOTO LIBRARY

Caption: Ring-pull mobile telephone. Hands charging up a prototype of a ring-pull mobile telephone. This battery-free telephone never needs charging from a mains supply. Pulling the cord a few times charges a generator in the disc-shaped telephone, which provides power for over five minutes of talking. The yellow circle on the telephone's surface is a pull-down microphone into which the user speaks. The yellow keys around the disc's edge are for dialling. Speaking a name into the microphone causes it to automatically dial their number from its address book. This award-winning device was designed by Christopher Jung (born 1969) while he was at University of Berlin, Germany.

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Keywords: batteryless mobile telephone, communication, communications, communications technology, mobile, mobile telephone, ring-pull, ring-pull mobile telephone, technological communication, telephone, voice-recognition, wind-up pho

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