1. Adopting digital filter technology 2. Selectable 50Hz or 60Hz band stop filter3. 500Hz, 7 /12 lead synchronous sample and analysis 4. Character Classification Up to twelve sort, and 3-channel ST Segment Monitoring5. Anti high-frequency electric-knife6. Adopting single 5V power supply,low consumption and safely insulation 7. 5V TTL Communication8. 2-channel temperature detect ,and two sort of sensor model9. Detecting respiration by impedance between RA-LL