The hertz is equivalent to cycles per second. Kilohertz, or a kHz, is a measurement of frequency equivalent to 1,000 hertz. Kilohertz is unit of measurement for audio signals, alternating current, and a measurement of wireless signals. The frequencies of sound waves, since the audible spectrum of sound frequencies is between 20 Hz and 20 KHz are measured in kilohertz. For example, middle C (C4) on a piano keyboard produces a frequency of 261.63 Hz.
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The computer mouse as we know it today was invented and developed by Douglas Engelbart, with the assistance of Bill English, during the 1960’s and was patented on November 17, 1970