Product features: Accurate pacing pulse identification and automatic analysis function Manual,auto,examination,storage modes [Freezing function] can replay 12 seconds cardiograph before or after Examination can be finished quickly under the [examination] mode,saving energy and paper Storage and reply cardigraph without printing parameters or diagnosis under the storage mode Clinical information input (ID/Name/Sex/Age ect.) Build-in rechargeable li-lon battery Adopt to 110-230V,50/60HZ AC power supply 12 leads waveform review and 250 patient information storage(SD card is expandable) USB and RS232 communication interface(ECGnet management software is optional) USB interface for net transmission,USB flash disk and printer(optional)