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