Model number: ECG-923 (Three channel) Dimension:310mmX235mmX66mm Packing:375mmX295mmX195mm Weight:4.5kg(gross); 3.57kg(net) Three channel with interpretive Build in rechargeable Li battery Chinese/English language Simultaneous 12 leads 320X240 graphic LCD, 5.7 inch screen Paper size: 80mmX20/30m Built in RS232 interface (USB is optional) 128 patients save/copy/communication