A601/A601B/A601B1 is a single channel ECG machine, which is designed with portable and easy to use. It is remarkably transportable and bring with them high efficiencies in both regular tests and emergencies. Product Description ? Single channel ECG machine with measurement ? Work modes: Manual/Auto/Arrhythmia analysis modes ? Built in rechargeable Ni-MH battery ? Adapter 110-230V, 50/60Hz AC power supply ? Built in USB/RS232 interface (ECGNET software optional) ? ECG waveform,16 patient save/reply ? Automatic interpretation(only for ECG-601BI