1)Adopt digital signal processing technology and get high-quality ECG waveform via power frequency filter, baseline filter and EMG filter of ECG signal. 2)Adopt high-resolution thermal printing system(8 dot/mm), no need for any adjustments. Recording frequency: up to 150Hz. 3)Real-time and continuously record clear and accurate ECG waveform and annotation character(including lead mark, sensitivity, paper speed and filter state, etc.).