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A smartwatch is a portable wearable computer resembling a wristwatch. Most modern smartwatches are operated via a touchscreen, and often rely on mobile apps that run on a connected device such as a smartphone to provide some core functions.
Early smartwatches could perform basic tasks such as calculations, digital time telling, translations, and game-playing. Newer smartwatches often have features similar to smartphones such as the use of apps, a mobile operating system, Bluetooth or WiFi connectivity, or the ability to function as portable media players and FM radios. Some models have mobile cellular functionality such as making telephone calls.[1][2][3]
While internal hardware varies, most smartwatches have a backlit LCD or OLED electronic visual display[4] and are usually powered by a rechargeable Lithium-ion battery. They may also incorporate GPS receivers, digital cameras, microSD card readers, and various internal and environmental sensors such as thermometers, accelerometers, altimeters, barometers, gyroscopes, and ambient light sensors. Some smartwatches also function as activity trackers and include body sensors such as pedometers, heart rate monitors, galvanic skin response sensors, and ECG sensors. Software may include maps, health and exercise-related apps, calendars, and various watch faces.