The S8 Ultra 4G Smart Watch is a cutting-edge smartwatch that supports SIM cards and runs on Android 8.1 OS. It has a sporty square design with a 2.08-inch large IPS screen and is equipped with several features including a heart rate monitor, SPO2 blood oxygen monitor, Multi-sport modes, 1GB RAM, and 16GB ROM. With its built-in card slot, the S8 Ultra 4G Smart Watch sim card allows you to stay connected wherever you go. You can make and receive calls, send messages, and access the internet directly from your wrist, without the need for your smartphone. It's the perfect companion for the modern, tech-savvy individual who values both style and functionality.