Smartwatches rely on several key technologies for their functionality, primarily including Bluetooth, Wi-Fi, and GPS. These technologies enable smartwatches to connect to smartphones for notifications and calls and to track location and fitness data. Additionally, smartwatches utilize sensors like accelerometers and heart rate monitors to collect health metrics. The integration of touchscreens and operating systems allows user interaction and app functionality. Innovations in battery technology also play a critical role, ensuring long-lasting performance in compact devices.