features: 1.digital one channel ecg machine; 2.simultaneous 12 leads acquisition; 3.high frequency response reach to 150hz; 4.multiple operation mode (manual /auto/ref. lead); 5.high resolution digital inhibits baseline; 6.ac/dc power, built in rechargeable ni-mh battery; 7.high resolution thermal printing array system; 8.lcd to display operation status and heart rate(digit and word); 9.capable of printing continuous one channel trace and annotations including lead mark and such parameters as sensitivity, paper speed, and filter operation status; 10.one-touch operation able to enhance efficiency and relieve operation strain; 11.visual status due to light indicated touch-keys; 12.rechargeable battery supporting more than 50 patient examinations; 13.under the automatic mode, pressing key mode continuously can keep recording when abnormal lead is found; 14.concept of floating input circuit meets iec safety standard; 15.safety level corresponds to class i, type cf.