This model shows a Smart Watch: The Amazfit GTR 3 Pro. It runs on the system Zepp OS, is compatible with every smartphone and offers over 150 Sport modes. It comes with an integrated BioTracker 3.0 sensor which measures SpO2, heart rate, stress and sleep. It can be connected via Bluetooth and has storage for offline music in capacity of 2.3GB. The battery lasts up to 12 days which is longer than most prime brand smart watches like Apple Watch which are more costly and only last a few days (depending on the model). The price at the moment is about 100€, so basically you get a lot for less money. The Amazfit GTR 3 Pro is a cheap essential gadget for fitness enthusiasts and professionals who need a stylish and simple working life measuring gadget.