The Series 4 now has several new health-focused features, which are very intriguing, including the ability to detect when you fall and even alert emergency contacts if need be, as well as an electrical heart rate sensor that works with an app to alert you to heart health issues. The electrocardiogram (ECG) app has been certified by the Food & Drug Administration, but it's not out yet.
It has all the same core fitness and sports tracking as the Series 3, including built-in GPS and a swimproof design. You can also expect improvements in run tracking and new supported activities like yoga and hiking. It comes packing LTE once again so you can take it out sans iPhone and still make/receive calls, get texts and all other notifications you would on your phone. A new speaker should also make Siri chats and phone calls sound louder and clearer.
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Software may include digital maps, schedulers and personal organizers, calculators, and various kinds of watch faces. The watch may communicate with external devices such as sensors, wireless headsets, or a heads-up display. Like other computers, a smartwatch may collect information from internal or external sensors and it may control, or retrieve data from, other instruments or computers. It may support wireless technologies like Bluetooth, Wi-Fi, and GPS. For many purposes, a "watch computer" serves as a front end for a remote system such as a smartphone, communicating with the smartphone using various wireless technologies. Smartwatches are advancing, especially their design, battery capacity, and health-related applications.[5]


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Bottom line: Some fitness trackers work equally well with an iPhone or Android device, but some smartwatches are built to pair with Android phones so you won’t enjoy full functionality and pairing on an iPhone. The Apple Watch only pairs with the iPhone so is off limits to Android users. Your existing phone choice will play an important part in choosing a smartwatch. You can check your smartphone’s compatibility with a range of Google Wear-powered smartwatches at g.co/WearCheck
Built-in GPS and a great workout coach make the Huawei Watch 2 a great companion on long runs and intense workouts. You can leave your phone behind, too, thanks to onboard music storage and the ability to connect Bluetooth headphones to the watch. Like the LG Watch Sport, the Huawei Watch 2 has an LTE version, but unfortunately, Huawei isn't selling that model in the US yet.
None of the newly tested models’ time displays time out when the watches are inactive, which we’ve seen happen on previously tested smartwatches. The time displays of the LG, Samsung, and Motorola models have a setting to keep them always on, though they dim after a little while. The Martian Notifier and Cookoo2 have traditional analog watch faces.
If you’re trying to decide which one is right for you, allow us to help. The Versa is smaller and looks good on most wrist sizes, while the Ionic is probably best for large wrists. The other main difference is GPS connectivity — the Ionic comes with built-in GPS, while the Versa does not. However, you can pair it with your smartphone if you don’t mind bringing it with you on a run. 

The TicWatch Pro shares the TicWatch E model’s older processor and late arrival, and it would be just another big (45 mm case), thick (12.6 mm) Android smartwatch, if not for its trick of having an old-fashioned-looking LCD screen that the watch switches to when you’re not actively looking at it or using it. This feature extends battery life significantly, especially if you go for periods in Essential Mode, where you see only the LCD screen showing the time, date, and your step count. But the transition from the LCD screen back to a “smart” OLED screen is not smooth or quick, and if you switch the watch to Essential Mode, you have to reboot it to get back to regular smartwatch functions.
The hardware is now “swimproof” with improved water resistance and there’s also now a heart rate sensor. Those work with the new Google Fit app to improve the fitness experience from your watch. Further, the Falster 2 has built-in GPS and NFC as well. This opens up Google Pay functionality for the watch for mobile payments in-store. Of course, Wear OS is still at the center of the experience, and the whole thing runs on the Qualcomm Snapdragon Wear 2100.
As of July 2013, the list of companies that were engaged in smartwatch development activities consists of Acer, Apple, BlackBerry, Foxconn/Hon Hai, Google, LG, Microsoft, Qualcomm, Samsung, Sony, VESAG and Toshiba. Some notable omissions from this list include HP, HTC, Lenovo, and Nokia.[59] Science and technology journalist Christopher Mims identified the following points in relation to the future of smartwatches:
We pulled together a list of currently available smart watches that met these criteria from Apple, Android Wear, and Samsung. Our list included watches from tech brands like Apple, Asus, and Samsung, as well as fashion labels like Fossil, Nixon, and Tag Heuer. Then, we cross-checked with respected review sites, such as Tech Radar and PCMag, as well as tech retailer Best Buy, to make sure we weren’t leaving out any hidden gems.
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