Christopher Jung charging up his ring-pull phone

Christopher Jung charging up his ring-pull phone

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This image is part of the feature Ring Pull Mobile

Credit: VOLKER STEGER/SCIENCE PHOTO LIBRARY

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Caption: Ring-pull mobile telephone. Designer Christopher Jung (born 1969) winding up a prototype of his ring-pull mobile telephone. This battery-free tel- ephone 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. Dialling is done on the yellow keys around the disc's edge. Also, speaking a name into the microphone causes it to automatically dial their number from its address book. Jung designed this award-winning device while at University of Berlin, Germany.

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

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