Micro ECG Recorder is necessary for patients with any kind of cardiac diseases, especially various type of arrhythmia and patients who are under risk of getting cardiac diseases led by hypertension, diabetes, hyperlipidemia, obesity, and other endocrine disorder. People who have palpitation, ,dyspnea, chest distress, and other discomfort in precordium with unknown causes also need ECG Recorder to monitor their heart function, as well as the middle-aged and elderly people when having physical exercise and athletes with intense physical activity.