Features:OS Configuration:Runs on Android 9.1 OS, powered by SC9832E+NRF52832 dual-chip Quad-core CPU. 1GB RAM+16GB ROM (or 4GB RAM+64GB ROM Optional) ultimately delivers a richer using experience.Built-in Nano SIM Slot:Supports BT4.1, 2.4G WiFi, and 4G LTE network. Just plug in your Nano SIM card to make a call directly, no need to carry your mobile phone when exercising.Fitness Tracker:Intelligently calculate your steps, distance, and calories, taking care of your health. Supports monitoring your heart rate, blood oxygen, and sleep to keep abreast of your physical condition.1.6-inch IPS Touch Screen:1.6-inch IPS touchscreen with a resolution of up to 400*400p, the picture is smooth and clear, stylish and cool without losing vitality. Multiple dial interfaces are changeable.More Convenience:Dual 5MP HD camera records every good moment. It also supports face recognition unlocking. 9 exercise modes are optional, allowing you to better manage your health activities. IP67 life waterproof, enjoy sports freely.Note: Please do not immerse the watch into or rinse with the water.