The C90 Max is an Android smartwatch that functions like a standalone phone, featuring 4G connectivity, a SIM card slot, dual cameras, 4GB RAM, and 64GB storage. It includes various health and fitness tracking features like heart rate and sleep monitoring, along with GPS, Wi-Fi, and Bluetooth. The watch boasts a large display, supports downloading apps from the Google Play Store, and comes with multiple interchangeable straps for customization.