Smartwatch

smart watchsmartwatcheswatch phoneWristwatch computersmart watcheswatchesAbacus PDA WatchRC-20Smartwatch global market sharewatch
A smartwatch is a wearable computer in the form of a wristwatch; modern smartwatches provide a local touchscreen interface for daily use, while an associated smartphone app provides for management and telemetry (such as long-term biomonitoring).wikipedia
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Wearable computer

wearable computingwearableswearable
A smartwatch is a wearable computer in the form of a wristwatch; modern smartwatches provide a local touchscreen interface for daily use, while an associated smartphone app provides for management and telemetry (such as long-term biomonitoring).
Seiko Epson released the RC-20 Wrist Computer in 1984.

Handheld electronic game

LCD gamehandheld electronic gamesLCD games
While early models could perform basic tasks, such as calculations, digital time telling, translations, and game-playing, 2010s smartwatches have more general functionality closer to smartphones, including mobile apps, a mobile operating system and WiFi/Bluetooth connectivity.
This simplicity means they can be made as small as a smartwatch, and sometimes are.

Watch

wristwatchwatcheswristwatches
A smartwatch is a wearable computer in the form of a wristwatch; modern smartwatches provide a local touchscreen interface for daily use, while an associated smartphone app provides for management and telemetry (such as long-term biomonitoring).
Developments in the 2010s include smartwatches, which are elaborate computer-like electronic devices designed to be worn on a wrist.

Mobile operating system

mobile platformsmobile OSmobile
While early models could perform basic tasks, such as calculations, digital time telling, translations, and game-playing, 2010s smartwatches have more general functionality closer to smartphones, including mobile apps, a mobile operating system and WiFi/Bluetooth connectivity.

Transflective liquid-crystal display

transflectivetransflective liquid crystal displaytransflective LCD
Some use transflective or electronic paper, to consume less power.
Some 21st century smartwatches such as the Pebble Smartwatch and the Amazfit Stratos also use transflective LCDs.

Timex Datalink

Timex Datalink USBIronman DatalinkTimex Data Link
The Timex Datalink wristwatch, was introduced in 1994.
Timex Datalink or Timex Data Link is a line of early smartwatches manufactured by Timex and is considered a wristwatch computer.

Ruputer

Seiko launched the Ruputer in Japan - a wristwatch computer with a 3.6 MHz processor.
The Ruputer is a wristwatch computer developed in 1998 by Seiko.

Smartphone

smartphonessmart phonesmart phones
While early models could perform basic tasks, such as calculations, digital time telling, translations, and game-playing, 2010s smartwatches have more general functionality closer to smartphones, including mobile apps, a mobile operating system and WiFi/Bluetooth connectivity.
A mobile operating system (or mobile OS) is an operating system for phones, tablets, smartwatches, or other mobile devices.

Fossil Wrist PDA

AU5005Wrist PDA
In 2003, Fossil released the Wrist PDA, a watch which ran the Palm OS and contained 8 MB of RAM and 4 MB of flash memory.
The Fossil Wrist PDA is a smartwatch that runs Palm OS.

Linux

GNU/LinuxLinux on the desktopLin
In June 2000, IBM displayed a prototype for a wristwatch that ran Linux.
This includes routers, automation controls, televisions, digital video recorders, video game consoles, and smartwatches.

Pebble (watch)

PebblePebble watchPebble Smartwatch
Pebble (watch) was an innovative smartwatch that raised the most money at the time on Kickstarter reaching $10.3 Million between 12 April – 18 May 2012.
Pebble is a discontinued smartwatch developed by Pebble Technology Corporation.

Heart rate monitor

heart monitorHeart rate sensorheart rate monitors
Peripheral devices may include digital cameras, thermometers, accelerometers, pedometers, heart rate monitors, altimeters, barometers, compasses, GPS receivers, tiny speakers, and microSD cards, which are recognized as storage devices by many other kinds of computers.
In recent years, it has been common for smartwatches to include heart rate monitors, which has greatly increased popularity.

Smart Personal Objects Technology

SPOT
SPOT stands for Smart Personal Objects Technology, an initiative by Microsoft to personalize household electronics and other everyday gadgets.
SPOT was first announced by Bill Gates at the COMDEX computer exposition event in 2002, and additional details were revealed by Microsoft at the 2003 Consumer Electronics Show where Gates demonstrated a set of prototype smart watches—the first type of device that would support the technology.

Personal organizer

day plannerpersonal organiserday planners
Software may include digital maps, schedulers and personal organizers, calculators, and various kinds of watch faces.
This process has accelerated in the beginning of the 21st century with the advent of smartphones, tablet computers, smartwatches and a variety of mobile apps.

Omate TrueSmart

TrueSmart
In 2013, the claim to first ever smartwatch to capture the full capability of a smartphone was laid by startup Omate with the TrueSmart.
The Omate TrueSmart was a smartwatch designed by Omate, a Chinese company based in Hong Kong and Shenzhen.

Barometer

barometricaneroid barometerbarometers
Peripheral devices may include digital cameras, thermometers, accelerometers, pedometers, heart rate monitors, altimeters, barometers, compasses, GPS receivers, tiny speakers, and microSD cards, which are recognized as storage devices by many other kinds of computers.
A barometer can also be found in smartphones such as the Samsung Galaxy Nexus, Samsung Galaxy S3-S6, Motorola Xoom, Apple iPhone 6 smartphones, and Timex Expedition WS4 smartwatch, based on MEMS and piezoresistive pressure-sensing technologies.

Wearable technology

wearablewearable devicewearable devices
Wearable technology, such as Google Glass, may evolve into a business worth US$6 billion annually and a July 2013 media report, revealed that the majority of major consumer electronics manufacturers were undertaking work on a smartwatch device at the time of publication.
It appears prominently in consumer electronics with the popularization of the smartwatch and activity tracker.

Samsung Galaxy Gear

Galaxy Gear
As of 4 September 2013, three new smartwatches have been launched: the Samsung Galaxy Gear, Sony SmartWatch 2, and the Qualcomm Toq.
The Samsung Galaxy Gear is a smartwatch produced by Samsung Electronics in the Samsung Gear family of devices.

Qualcomm Toq

As of 4 September 2013, three new smartwatches have been launched: the Samsung Galaxy Gear, Sony SmartWatch 2, and the Qualcomm Toq.
The Toq (pronounced “tok” as in "tick-tock") is a smartwatch developed by Qualcomm released as a proof of concept to OEMs and was released in limited quantities in December 2013.

Apple Inc.

AppleApple ComputerApple Inc
It was compatible with most of the popular PCs of that time, including Apple II, II+ and IIe, the Commodore 64, IBM PC, NEC 8201, Tandy Color Computer, Model 1000, 1200, 2000 and TRS-80 Model I, III, 4 and 4p. On 9 September 2014, Apple Inc. announced its first smartwatch called Apple Watch to be released in early 2015.
The original Apple Watch smartwatch was announced by Tim Cook on September 9, 2014, being introduced as a product with health and fitness-tracking.

Calculator watch

calculationscalculatorswatches
While early models could perform basic tasks, such as calculations, digital time telling, translations, and game-playing, 2010s smartwatches have more general functionality closer to smartphones, including mobile apps, a mobile operating system and WiFi/Bluetooth connectivity.

Sony Ericsson LiveView

LiveView
Sony Ericsson launches the Sony Ericsson LiveView, a wearable watch device which is basically an external Bluetooth display for an Android Smartphone.

LG G Watch

G Watch
At Google I/O on 25 June 2014, the Android Wear platform was introduced and the LG G Watch and Samsung Gear Live were released.
The LG G Watch (model W100, codenamed Dory) is an Android Wear-based smartwatch announced and released by LG and Google on June 25, 2014.

AMOLED

Super AMOLEDActive-matrix OLEDHD Super AMOLED
The model features a curved Super AMOLED display and a built-in 3G modem, with technology writer Darrell Etherington stating on the TechCrunch website, "we’re finally starting to see displays that wrap around the contours of the wrist, rather than sticking out as a traditional flat surface."
AMOLED (Active-Matrix Organic Light-Emitting Diode, ) is a display device technology used in smartwatches, mobile devices, laptops, and televisions.

Apple Watch

Apple Watch Series 4Apple Watch EditionApple
On 9 September 2014, Apple Inc. announced its first smartwatch called Apple Watch to be released in early 2015.
Apple Watch is a line of smartwatches designed, developed, marketed and sold by Apple Inc. It incorporates fitness tracking and health-oriented capabilities with integration with iOS and other Apple products and services.