simultaneously acquisition of 12-lead ecg data, iec class i, type cf safety standard operation menu and parameter setting via lcd high resolution thermal printing array system manual: single channel auto i: standard single channel auto ii: standard single channel plus rhythm lead measurement function under auto mode operation memory for storing ecg data for later printing ac/dc power, built in rechargeable ni-mh battery filter for ac, emg and dft function of heart rate detection and protection against possible pulse shock while pacemaker applied real time clock, heart rate examination usb interface and rs232 ensures convey of ecg data option: ecg software for net-working capacity