1. Adopting digital filter technology 2. Selectable 50Hz or 60Hz band stop filter 3. 500Hz、7 lead synchronous sample and anlysis 4. Character Classification Up to twelve sort, and 3-channel ST Segment Monitoring 5. Anti hight-frequency electric-knife 6. Adopting single 5V power supply、low consumption and safely insulation 7. 5V TTL Communication 8. 2-channel temperature detect ,and two sort of sensor model 9. Detecting respiration by impedance between RA-LL