As a high-performing fitness smart watch, the HUAWEI WATCH GT 2 comes with the following sensors - Accelerometer sensor- Gyroscope sensor- Geomagnetic sensor- Optical heart rate sensor- Air pressure sensorAll of these sensors work to take the different body and environment readings telling you information about how fast you are running to the altitude you are running at and much more so you can stay focussed on your workout and monitor your performance, allowing you to constantly improve.