Smart Watch is a wearable computer that is the shape of a wristwatch. The latest Smart Watch offer a local touchscreen interface that can be used for everyday use. Although early models could perform simple tasks like calculations and digital time-telling games and translations, Smartwatches released after 2015 are more functional and more similar to smartphones, such as mobile applications and an operating system for mobile devices such as Bluetooth and WiFi connectivity. Certain smartwatches are portable media players with FM radio and digital video and audio files playback using Bluetooth. Bluetooth headset. Specific models, referred to as watch phones, feature the capability of mobile cellular, for instance, making phone calls. The internal hardware can vary, but most devices have an electronic display, either OLED or backlit LCD. Some make use of electronic or transflective paper to use less energy. Rechargeable lithium-ion batteries typically power them. The software can comprise digital maps scheduling software and calculators, personal organizers and different designs for the watch face. The watch can connect with sensors and wireless headsets. It can also be compatible with Bluetooth, WiFi, and GPS. Smartwatches are evolving in design, battery capacity, and health-related applications. Health-related applications can include apps that monitor heart rate and SpO2, workouts and so on.