Sensor | compass, altimeter, 3-axis accelerometer, gyroscope, ambient light sensor, barometer, magnetometer, oxygen saturation (SpO2) monitor, ECG monitor, multi-path optical heart rate sensor, electrical sensor, skin temperature sensor | Huami self-developed BioTracker PPG (support blood oxygen), acceleration sensor, gyroscope, 3-axis geomagnetic sensor, ambient light sensor, air pressure sensor, temperature sensor |