Product Features: Accurate pacing pulse identification and automatic analysis function Manual / Auto / Examination / Storage Modes. [Freeze] function can replay 12 seconds cardiograph front and back. Examination is finished quickly under the [Examination] Mode, saving energy and paper. Store and replay cardiograph without printing parameters or diagnosis under the [Storage] Mode. Clinical information input [ ID / Name / Sex / Age ] 12 leads waveforms play, with 250 patient information storage (Expandable) 800*400 graphic 5 inch color screen LCD Built-in rechareable Li-lon battery. Adapt to 110-230V,50/60Hz power supply. USB interface allows net transfer,USB flash disk and USB printer (optional) connected ECGNET software optional