Answer :
1) For the better training, you need a proper breathing way and breathing posture.

2) Correct breathing : Inhale and exhale through the nose during the training.

3) Correct breathing posture : Do training in accordance with the Breath Pacer in a comfortable position without  moving your body and finger.

4) If your finger is too tight on the sensor, can not analyze the exact breath data. If you stuck your finger on the sensor
      too tightly, also can not sensing correctly. If your finger is too tight, use a different finger on the sensor.

5) During training, the training operation is automatically  stopped when your finger falls off from the ResCalm device.

6) In addition, the program is automatically stopped when can not sensing due to the wrong position of the finger.

7) It is recommended that you use at room temperature where you can use your smart phone.