Features: 1.English menu display 2.Lead off/on signal by indicator light 3.Selectable multi-recording modes:3 channels,3 channels + rhythm 60 sec compressible: select simultaneously acquisition of 12-lead ECG signals 4.Automatic diagnosis and analysis 5.Save the half record paper and the half record time 6.The body check mode can record the patient ECG 15 seconds/each 7.Thermal printer (dot array),40 dot/mm,precise waveform 8.Rechargable battery pack 9.Hidden handle. Specifications: Acquisition mode: simultaneous 12 leads Operating mode: auto/manual Recording format: auto/manual/simultaneously 60 sec compressible LCD display: operation mode/ Status, HR Input Condition: against defibrillation Input impedance: >50MQ Patient Leakage Current: 3.2 s CMRR: > 100dB Filter:50Hz or 60 Hz (-20dB) prift(0.5Hz-3dB) Sensitivity Option: Auto,2.5,5,10,20,40mm/mv=2% Resist to polarization voltage:=500mV Electrical noise level: