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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 first digital watch was the Pulsar, introduced by the Hamilton Watch Company in 1972. The "Pulsar" became a brand name, and would later be acquired by Seiko in 1978. In 1982, a Pulsar watch (NL C01) was released which could store 24 digits, likely making it the first watch with user-programmable memory, or the first "memorybank" watch.
Smart masks "contain a sensor that monitors the presence of a SARS-CoV-2 protease in the breath." [72] Contained in the mask is a blister pack, which, when broken, causes a chemical reaction to occur. As a result of the chemical reaction, the sensor will turn blue if the virus is detected from an individual's breathing. [72]
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.
The Pebble's apps used data received from a connected phone for distance, speed, and range information. More apps were downloadable via a mobile phone or tablet, and a software development kit (SDK) was freely available. [43] Pebble integrates with Android and iOS phones through a companion app to send notifications to the watch. [44]
The last message about them dates to 2004, [53] saying the device would cost about $250, but it is still under development. In 2002, Fossil, Inc. announced the Fossil Wrist PDA, which ran the Palm OS. Its release date was set for summer of 2003, but was delayed several times and was finally made available on 5 January 2005.
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