Technologies used to develop smart wearable devices include miniaturized sensors, microcontrollers, Bluetooth connectivity, and sometimes machine learning algorithms. Key components like accelerometers, heart rate monitors, and GPS modules collect data about user activities and health metrics. Development also often utilises software development kits (SDKs) for mobile integration, alongside platforms that help manage and analyze the collected data. Wearable devices usually interface with smartphones or cloud services to provide users with insights, tracking, and connectivity.