A 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 for management and telemetry
While early models could perform basic tasks, such as calculations, digital time telling,
and game-playing, 2010s smartwatches have more general functionality closer to smartphones, including mobile apps, a mobile operating system and WiFi/Bluetooth connectivity.
Some smartwatches function as portable media players, with FM radio and playback of digital audio and video files via a Bluetooth headset.
Some models, called watch phones (or vice versa), have mobile cellular functionality like making calls.
While internal hardware varies, most have an electronic visual display, either backlit LCD or OLED.
Some use transflective or electronic paper, to consume less power. They are generally powered by a rechargeable lithium-ion battery.