Three/Six Channel Intepretive ECG Machine 3/4/6 channel printout format Simultaneous 12 lead acquisition Automatic measurement and interpretation of standard ECG parameter Memory of 16 exams for recall and duplication 5 inch 320x240 LCD to display setting menu and 6 channel ECG waveform Built in RS232 interface supporting data transmission to PC Dual power operation, AC and Li-ion battery supporting 2 hour operation AC, EMG, DFT filter Paper size: 112mmx20m roll type