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.