... in rechargeable Li batteryChinese/English languageSimultaneous 12 leads320X240 graphic LCD, 3.8 inch screenPaper size: 63mmX20/30mBuilt in RS232 interface (USB is optional ... valve≤20μVInter-Channel Interference≤0.5mmPaper speed25,50mm/s(±3%)SensitivityAUTO,2.5,5,10,20mm/mVRecording modeThermal Array printingPaper ...