A smartwatch is a mobile device which consists of a package, including the computer and the display, attached to a bracelet. While early models can perform basic tasks, such as calculations, digital time telling. translations, and game-playing. Many run mobile apps, using a mobile operating system and Bluetooth connectivity. Some smartwatches function as portable media players, with FM radio and playback of digital audio and video files via a Bluetooth or USB headset. Some models also called 'watch phones' (or vice versa), feature full smartphone capability and have complete functionality of a typical smartphone.