The company claims that the SpO2 monitor will help its devices look for signs of sleep apnea and other breathing problems, potentially great features for devices that are meant to be worn 24/7. It'll be used primarily in Fitbit's forthcoming Sleep Score Beta, which further analyzes sleep quality using heart rate and breathing data. Starting sometime this November, users with devices that only have heart rate monitors can get a "sleep score" after each night's sleep. Those with an Ionic, Versa, or Charge 3 will presumably have better data thanks to the SpO2 monitor collecting breathing data.
Despite that, it's a very competent Android Wear 2 watch. What's more interesting, however, is the concentration on fitness.While it features all of the necessary sensors to track running, cycling and swimming, our initial testing has revealed the Huawei Watch isn't the stellar performer we hoped it would be. Which is a shame, because emphasising the fitness element was exactly the right thing for Huawei to do, and hopefully the company can improve its fitness tracking software updates.
The Samsung Gear Live is the first of the company’s smartwatches to be compatible with any Android phone running Android 4.3 or higher; other Gear models can be paired only with specific Samsung phones. Like the LG G Watch and Moto 360, it runs the Android Wear OS, allowing voice commands and pushing relevant information to the wearer. Compared with the LG G Watch, we prefer the style and fit of the Gear Live. The watch body is slightly curved, which made it more comfortable. The Gear Live also has a heart-rate monitor, which the G Watch lacks.
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. Apple released on September 22, 2017 their Apple Watch Series 3 model which offers built in LTE cellular connectivity allowing phone calls, messaging and data without relying on a nearby smartphone connection. 
We've just completed lab tests on six of the newest smartwatches to hit the market. Three run on the very promising Android Wear operating system, which Google created specifically for wearable devices—the LG G Watch, Samsung Gear Live, and Motorola Moto 360. We also tested several basic models: the Martian Notifier, Cookoo 2, and MetaWatch M1. And we included reviews of nine smartwatches that we tested previously; all are still available, and we updated their prices. Find out what we liked and didn't like about the six newly tested models.
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The Charge 3's screen has 40-percent more active space than the Charge 2 has, and it makes for a better touchscreen overall. From the watch face, swipe from top to bottom to reveal the notification drawer; from bottom to top to see the daily dashboard; and side to side to see available apps. Transitions between screen pages are smooth, and stick-figure animations in apps like the Exercise app move with ease.
I've been pleased to see swim-tracking trickle down into more affordable devices over the past few years. Fitbit's Flex 2 remains its most affordable device with swim-tracking features, priced at $60. But the $150 Charge 3, with its big display and smattering of smartwatch capabilities, is for a different audience than those who would gravitate to the tiny, quasi-cylindrical Flex 2. Even if you don't swim often, water-resistance up to 50 meters means users don't have to worry about showering with the Charge 3 or dropping it in the pool by accident.
Why we like it: Fossil’s Q Explorist and Venture watches are good-looking watches with a decent range of case and band options, and decent responsiveness and battery life—this is high praise given the current state of Android smartwatches. They can track steps, control music playback, give you turn-by-turn directions on your wrist, and allow you to respond to messages with your voice or quick-reply taps. But these two models are not unique: The Fossil Group offers an array of more than 300 smartwatches under different fashion brands—including Diesel, Skagen, Tag Heuer, Kate Spade, and Movado—that have essentially the same internal components and software, so you can pick the watch design you like best.