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2. Digital clock - Wikipedia

   en.wikipedia.org/wiki/Digital_clock

   Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).

3. History of timekeeping devices - Wikipedia

   en.wikipedia.org/wiki/History_of_timekeeping_devices

   The most accurate pendulum clocks were controlled electrically. [166] The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer.

4. Clock - Wikipedia

   en.wikipedia.org/wiki/Clock

   A common misconception is that a digital clock is more accurate than an analog wall clock, but the indicator type is separate and apart from the accuracy of the timing source. Talking clocks and the speaking clock services provided by telephone companies speak the time audibly, using either recorded or digitally synthesized voices .

5. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic counts the cycles of this signal and provides a numerical time display, usually in units of hours, minutes, and seconds.

6. Flip clock - Wikipedia

   en.wikipedia.org/wiki/Flip_clock

   A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology – the study and measurement of time and palette – and the Italian ...

7. Oregon Scientific - Wikipedia

   en.wikipedia.org/wiki/Oregon_Scientific

   In 2003, OSI partnered with SMaL, Axia and Fujifilm to produce a credit card-sized digital camera. [3] Other products include a waterproof digital video camera, [4] an alarm clock designed by Philippe Starck (a French designer), [5] a pedometer that keeps seven days' worth of data, [6] and an electronic UV monitor among others. [7]