Features: Accurate pacing pulse identification,automatic analysis function. Manual, auto, examination, storage modes. [Freezing function] can reply 12 seconds cardiograph before or after. Examination can be finished rapidly under examination mode, resource saving. Storage and replay of cardiograph without printing parameters or diagnosis under storage mode. Rapid input of patient information through keyboard. Build-in rechargeable li-lon battery. Adapt to 110-230V.50/60HZAC power supply. 12 leads waveform review and 250 patient information storage (SD card is expandable). USB and RS231 communication interface (ECG NET management software is optional). USB interface for net transmission, USB flash disk and printer is optional.