Smartwatches are relatively new gadgets, and their features are continuously improving. Each smartwatch needs to synch to your smartphone to get enhanced features. Once linked, depending on the model of smartwatch, you can forward emails, text messages, GPS directions and more to your wrist. Some smartwatches even have built-in microphones and speakers, allowing you to make phone calls. Calls are routed through your smartphone, just like when using a Bluetooth Headset. The Samsung watch—dubbed the Galaxy Gear—also has an integrated camera, so you can snap spontaneous photos without ever picking up your smartphone. Of course, ever smartwatch also functions as a traditional digital watch when not linked to a smart device. As the technology matures, expect to see more advanced features and perhaps even complete phone functionality built in.
While internal hardware varies, most have an electronic visual display, either backlit LCD or OLED or Hologram.[4] Some use transflective or electronic paper, to consume less power. Most have a rechargeable battery. Peripheral devices may include digital cameras, thermometers, accelerometers, pedometers, heart rate monitors, altimeters, barometers, compasses, GPS receivers, tiny speakers, and SD cards, which are recognized as storage devices by many other kinds of computers.
The MetaWatch M1, like the Cookoo 2 and Martian Notifier, is a basic smartwatch. It shows alerts for texts, e-mails, social media updates, calendar appointments, weather, and Caller ID, and can control your phone's music app. The notifications are configurable in terms of what you are alerted to and how: whether via a vibration or on the watch’s display. Also built in are a timer, a stopwatch, and an alarm

All but the Martian Notifier claim some degree of water resistance: the LG, Samsung, and Motorola models can survive underwater up to 1 meter for 30 minutes, the Cookoo2 up to 100 meters, and the MetaWatch up to 3ATM, which is equivalent to 30 meters. Only the Martian and Motorola models claim to have scratch-resistant screens (the Martian has an anti-scratch acrylic crystal and the Moto 3 uses Gorilla Glass 3).
Our top pick for most people is the Apple Watch Series 4 with GPS (starting at $399), which has a huge display, ultra-fast processor, Raise to Speak Siri, fall detection and a built-in electrical heart rate sensor for taking on-the-go electrocardiograms. It also runs watchOS 5, which makes the watch even more useful with automatic workout-tracking, offline podcast playback and a Walkie-Talkie voice chat feature.
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