... replay 2.Built in rechargable Li-Ion battery 14.4V 3.Built in USB/RS232 interface Features:Lead: Standard 12 leadsAcquisition ... : >50MΩPatient current leakage: <10µACalibrating voltage: 1mV±3%Voltage tolerance: ±500mVTime constant: >3.2sFrequent response: 0.05Hz~160HzNoise level: ≤15µVp ... -pThreshold: ≤20µVPaper speed: 25, 50mm/s (±3%)Sensitivity: Auto, 2.5, 5, 10, 20, 40mm/mVRecorder: High ...