... anti-interference with variety of filtering methods: DFT, AC,EMG, Lowpass Filter, recorder Filter. Ensure the waveform clearly, accurately and nondeformed; LCD ... leads waveform, manu, heart rate, leads title, printing speed, filter etc; Single channel, 1+R(Rhythm)channel, 60 seconds ... , with strong sealing, high reliability and long life; AC/ DC supplied and built in rechargeable battery suporting up ...