Health-related applications include applications measuring heart rate, SpO2, workout, etc. Smartwatches are advancing, especially their design, battery capacity, and health-related applications. 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. It may support wireless technologies such as Bluetooth, Wi-Fi, and GPS. 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. The watch may communicate with external devices such as sensors, wireless headsets, or a head-up display. Software may include digital maps, schedulers and personal organizers, calculators, and various kinds of watch faces. Peripheral devices may include digital cameras, thermometers, accelerometers, pedometers, heart rate monitors, altimeters, barometers, compasses, GPS receivers, tiny speakers, and microSD cards, which are recognized as storage devices by many other kinds of computers. They are usually powered by a rechargeable lithium-ion battery.
Some use transflective or electronic paper, to consume less power. While internal hardware varies, most have an electronic visual display, either backlit LCD or OLED. Some models, called watch phones (or phone watches), have mobile cellular functionality such as making telephone calls. Some smartwatches function as portable media players, with FM radio and playback of digital audio and video files via a Bluetooth headset. While early models could perform basic tasks, such as calculations, digital time telling, translations, and game-playing, smartwatches released since 2015 have more general functionality closer to smartphones, including mobile apps, a mobile operating system and WiFi/Bluetooth connectivity. A smartwatch from around 2005 ( Fossil Wrist PDA)Ī smartwatch is a wearable computer in the form of a watch modern smartwatches provide a local touchscreen interface for daily use, while an associated smartphone app provides management and telemetry, such as long-term biomonitoring.
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