The WS3 PRO is a new, less expensive smartwatch from China. You can use the wearable for Bluetooth calling, with a built-in speaker and microphone. The touchscreen watch is compatible with Android and iOS devices and has up to 7 days of battery life. Plus, the gadget has many health features, including blood oxygen, blood pressure and heart rate monitors.https://www.notebookcheck.net/WS3-PRO-smartwatch-is-a-cheaper-smartwatch-with-Bluetooth-calling-ECG-and-blood-pressure-monitor.639414.0.html
That's just a cheap amazfit knock off and almost all components are barely working ( heart rate monitor) and I bet there is no blood pressure monitoring, the first watch with that feature is from Huawei for 400 bucks