features: 1.digital one channel ecg machine; 2.simultaneous 12 leads acquisition; 3.multiple operation mode (manual /auto/ref. lead); 4.lcd to display operation status and wave-form; 5.high resolution digital inhibits baseline; 6.ac/dc power, built in rechargeable ni-mh battery; 7.high resolution thermal printing array system; 8.high frequency response reach to 150hz; 9.the wave-form is displaying synchronously on the lcd with 195 x65 dots; 10.capable of printing continuous one channel trace and annotations including lead mark and such parameters as sensitivity, paper speed, and filter operation status; 11.one-touch operation able to enhance efficiency and relieve operation strain; 12.visual status due to light indicated touch-keys; 13.rechargeable battery supporting more than 50 patient examinations; 14.under the automatic mode, pressing key mode continuously can keep recording when abnormal lead is found; 15.concept of floating input circuit meets iec safety standard; 16.safety level corresponds to class i, type cf.