Features: OS Configuration: Runs on Android 7.1 OS, powered by high-performance MT6739 Quad-core CPU. 3GB RAM and 32GB ROM provide plentiful room for storage and smooth high data speed. Built-in Nano SIM Slot: Supports independent 4G call function. Just plug in your Nano SIM card (Not included) to make a call directly, no need to carry your mobile phone when exercising. Sports Heart Rate Monitoring: Supports multiple sports modes. Generate trajectory maps and professional data analysis allow you to manage health activities. Supports heart rate monitoring and generates data display. Larger HD Screen: 1.6-inch round touchscreen with a resolution of up to 400*400p, the picture is smooth and clear, stylish and cool without losing vitality. More Convenience: Supports BT, GPS navigation, and WiFi. Built-in big speakers, you can enjoy music whenever and wherever you want. 8MP rear camera and 2MP front camera record every good moment.