Alexander Graham Bell invented the telephone on March 10, 1876, allowing for electrical transmission of speech through wires from one location to another. As a teacher for the deaf, Bell had great sensitivity to sound vibrations and their transmission. By 1880, just four years after its invention, there were nearly 48,000 telephones in use across the United States, demonstrating the telephone's importance as a revolutionary new means of communication that avoided physically traveling to communicate over distances.