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.
Model release not required. Property release not required.