we are offering ecg machines. product features portable 12 channel ecg machine manual / auto / arrhythmia analysis modes. 5.7 inch lcd alphabetic keyboard for patient information built in rechargeable li-ion battery. real-time ecg waveform, cases save / replay adapt to 110 - 230v, 50 / 60 hz, ac power supply . built in usb / rs232 interface (ecg net software optional)