Smartwatch

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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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Samsung Gear S3

Gear S3
On 31 August 2016, Samsung unveiled the Samsung Gear S3 smartwatch, with a higher specifications, there are at least two models, the Samsung Gear S3 Classic and the LTE version Samsung Gear S3 Frontier.
The Samsung Gear S3 is a Tizen-based circular smartwatch developed by Samsung Electronics.

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.
Smartwatches introduced in the 2010s are similar to calculator watches in both aesthetics and functionality, even though far more advanced in capabilities.

GPS watch

GPSGPS receiversGPS sports watch
Some watches can serve as full GPS watches, displaying maps and current coordinates, and recording tracks. "Sport watch" functionality often includes activity tracker features (also known as "fitness tracker") as seen in GPS watches made for training, diving, and outdoor sports.
The watch can have other features and capabilities depending on its intended purpose and be a smartwatch.

Activity tracker

fitness trackersmart bandfitness tracking
"Sport watch" functionality often includes activity tracker features (also known as "fitness tracker") as seen in GPS watches made for training, diving, and outdoor sports.
The term is now primarily used for smartwatches that are synced, in many cases wirelessly, to a computer or smartphone for long-term data tracking.

Mobile app

appmobile applicationapps
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 app or mobile application is a computer program or software application designed to run on a mobile device such as a phone/tablet or watch.

Wear OS

smartwatchWearWear OS By Google
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. Luxury watchmaker TAG Heuer released TAG Heuer Connected, a smartwatch powered by Android Wear.
Wear OS, also known as Wear OS by Google and previously called Android Wear, is a version of Google's Android operating system designed for smartwatches and other wearables.

Garmin

Garmin Ltd.Garmin CorporationGarmin Europe
The top smartwatches that debuted at the 2017 Consumer Electronics Show included the Casio WSD-F20, Misfit Wearables Vapor and the Garmin Fenix 5 series.
Due to their development in wearable technology, they have also been competing with activity tracker and smartwatch consumer developers such as Fitbit and Apple.

Casio Databank

Databank
Most notable was the Casio data bank series.
Smartwatch

Samsung Gear 2

Gear 2
Samsung released the Samsung Gear 2, Gear 2 Neo, Samsung Gear S, Samsung Gear S2 and Samsung Gear S3 running Tizen.
The Samsung Gear 2 and Gear 2 Neo are smartwatches produced by Samsung Electronics.

System on a chip

SoCsystem-on-a-chipsystem-on-chip
It was developed by Seiko Epson and was powered by a computer on a chip.
Systems-on-chip are frequently embedded in portable devices such as smartphones, GPS navigation devices, digital watches (including smartwatches) and netbooks.

TAG Heuer Connected

Connected
Luxury watchmaker TAG Heuer released TAG Heuer Connected, a smartwatch powered by Android Wear.
On November 9, 2015 TAG Heuer announced the launch of the first TAG Heuer smartwatch which they named Tag Heuer Connected.

AsteroidOS

AsteroidOS is an open source firmware replacement for some Android Wear devices.
AsteroidOS is an open source operating system designed for smartwatches.

Apple Watch

AppleApple Watch 2Apple Watch Edition
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, and marketed by Apple Inc. It incorporates fitness tracking and health-oriented capabilities with integration with iOS and other Apple products and services.

Asus ZenWatch

ZenWatch
The Asus ZenWatch is an Android Wear-based smartwatch announced on September 3, 2014 at IFA and released by Asus on November 9, 2014.

Ubuntu Touch

phone-based Ubuntu Touchtablet version of UbuntuUbuntu for phones
Ubuntu Touch is an OS developed by Canonical UK Ltd and Ubuntu Community for various mobile platforms including smartwatches.
Mark Shuttleworth announced on 2011-10-31 that by Ubuntu 14.04, the goal was that Ubuntu would support smartphones, tablets, smart TVs and other smart screens (such as car head units and smartwatches), but to date has only been supported by vendors on a few smartphones, one tablet and a number of third-party devices which hobbyists have ported the operating system to. The initial goal set by Shuttleworth for Ubuntu was to reach full convergence (same platform and libraries on all devices).

LG Watch Urbane

LG Watch Urbane LTE
The LG Watch Urbane is a smartwatch released by LG Corporation on April 27, 2015.

LG Watch Sport

Watch Sport
The LG Watch Sport is a smartwatch released by LG Corporation on Feb 09, 2017.

LG G Watch R

G Watch R
The LG G Watch R (model W110) is an Android Wear-based smartwatch announced and released by LG and Google on October 25, 2014.

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.

Neptune Pine

The Neptune Pine is an unlocked GSM standalone, full-featured smartwatch developed by Canadian consumer electronics and wearable technology company Neptune. It was announced in January 2013 by Simon Tian and launched in November 2013 on Kickstarter.

LG Watch Style

Watch Style
The LG Watch Style is a smartwatch released by LG Corporation on 9 February 2017.

MetaWatch

Meta Watch, Ltd
The MetaWatch is a brand name of smartwatches developed by Meta Watch, Ltd. Strata MetaWatch and Frame MetaWatch are digital smartwatches released in 2012, funded by raising money via the crowd funding platform Kickstarter.

Sailfish smartwatch

Sailfish OS is a Linux-based operating system for various platforms, including Sailfish smartwatches.
However the hardware platform was not developed, but only Sailfish OS and needed smartwatch software.

Samsung Gear Fit 2

Samsung Gear Fit 2 Pro
The Samsung Gear Fit2 is a fitness smartwatch made by Samsung Electronics.

AMOLED

Super AMOLEDactive-matrix OLEDOLED
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.