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The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Introduced in June 1989 [1] as a successor of the F-87W, [2] it is popular for its low price, long battery life and iconic design. [3] As of 2011, annual production of the watch is 3 million units, which makes it the most sold watch in the world. [4]
The watches in the G-Shock line are designed primarily for sports, military and outdoors-oriented activities; all G-Shocks have a chronograph feature, 200 metre water resistance and an alarm, with either a digital display, analogue display or a combination of analogue and digital displays.
In watches sold for timekeeping, analog display remains very popular, as many people find it easier to read than digital display; but in timekeeping watches the emphasis is on clarity and accurate reading of the time under all conditions (clearly marked digits, easily visible hands, large watch faces, etc.).
The watch had a small lens at the top of its face used for data transmission by visible light. [5] [21] Data was transmitted from the CRT of the computer through a series of pulsating horizontal bars, [22] [23] that were focused by the lens and written to the watch EEPROM memory through an optoelectronic transducer operating in the visible light spectrum and employing optical scanning technology.
Some fitness trackers are waterproof up to specific depths or time limits. Check the tracker's specifications before taking it in the shower or pool to make sure you don't damage your wearable ...
Not all announced apps were ready when the watch started shipping. CEO Eric Migicovsky announced on January 9, 2013, that updates for the watch's operating system would be released every 2–3 weeks until all features were added. [32] The Pebble's apps used data received from a connected phone for distance, speed, and range information.