3 channel ECG machine with measurement Manual/Auto/Arrhythmia Analysis Modes 80mm 3-ch recording with rhythm lead Built in rechargable Li-Ion battery 14.4V(2200mAh) Adapt to 110-230V,50/60HZ AC power supply Real-time ECG waveform,cases save/replay Built in USB/RS232 interface(ECGNET software optional) Package:40cmx34cmx22cm GW:4.6KG NW:1.7KG 320X240graphic 3.8 inch LCD 3 channel ECG machine with measurement Manual/Auto/Arrhythmia Analysis Modes 80mm 3-ch recording with rhythm lead Built in rechargable Li-Ion battery 14.4V(2200mAh) Adapt to 110-230V,50/60HZ AC power supply Real-time ECG waveform,cases save/replay Built in USB/RS232 interface(ECGNET software optional) Package:40cmx34cmx22cm GW:4.6KG NW:1.7KG 320X240graphic 5.7inch LCD,16cases save/replay