This item is Bluetooth model & International Version. (**IT DOES NOT SUPPORT 2G, 3G, 4G LTE MOBILE NETWORKS**);Compatible with Android 4.4 (KitKat) and later with 1.5GB RAM. Some features may not be available. For best compatibility, connect with Samsung Galaxy phones. (It does NOT support Samsung Tablet & iOS);The Gear S3 has a built-in speaker that lets you make or take calls right away without ever having to remove your phone from your pocket. (*Bluetooth model requires Wi-Fi connection and a voice call app for phone-free calls.);Battery : 380mAh (up to three days) (*Battery life may vary depending on usage and settings.) / Sensor : Accelerometer, Barometer, Gyro Sensor, HR Sensor, Light Sensor / Connectivity : Bluetooth v4.2, Wi-Fi b/g/n, NFC, MST, GPS/Glonass;Memory : 768MB (RAM) + 4GB (ROM) / Chipset : Exynos 7270, Dual 1.0GHz / OS : Tizen OS 2.3.2 / Etc : Mic, Speaker, Water and dust resistant IP68