A typical single-channel ECG machine has specifications including an input circuit with defibrillator protection, a 12-lead standard for lead selection, a <10µA patient leakage current, and a frequency response between 0.05Hz to 150Hz. It operates on a 50mm wide thermal paper roll, allows for paper speeds of 25 or 50mm/s, and features a built-in rechargeable battery for portable use. Additional features often include a digital signal processor for noise reduction, an auto-recording function, and a digital display.