... batteryHD-9000B Features*Monophasic DefibrillatorECG:*ECG lead: Ⅰ,Ⅱ,Ⅲ, a VR, a VL, a VF, V1-V6*S-T segment analysis: –2.0 ... ''TFT displayHD-8000BFeatures*Biphasic DefibrillatorECG:*ECG lead: Ⅰ,Ⅱ,Ⅲ, a VR, a VL, a VF, V1-V6*S-T segment analysis: –2.0 ...