View of the keys and sensors of a mobile telephone

View of the keys and sensors of a mobile telephone

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Caption: Mobile telephone keypad. Close-up of the external and internal parts of a mobile telephone keypad. In the complete telephone, each key (white) lies above a sensor (gold and black circles) on the keypad's circuit board, which passes on a signal when the key is pressed. Mobile telephones use microwaves to carry call information, and so their use is not hampered by wires.

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Keywords: circuit board, communication, communications, communications technology, key, keyboard, keypad, mobile, mobile phone keypad, mobile telephone, phone keypad, sensor, technological communication, telephone

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