The specified capacitor is a CAP ALUM POLY 680UF 20 4V T/H. Its key characteristics include a capacitance of 680 microfarads, an operating voltage of 4 volts, and its construction utilizes aluminum-polymer materials in a radial, can configuration with an internal resistance of approximately 5 milliohms. This component is designed to withstand temperatures up to 105 degrees Celsius for durations exceeding 2000 hours.