The CAP ALUM POLY 820UF 20 4V T/H capacitor is a type of radial, can aluminum-polymer capacitor with a high capacitance value of 820 microfarads (µF) and a working voltage of 4 volts. It has a low equivalent series resistance (ESR) of 7 milliohms (mO) and an operating life of up to 2000 hours at a temperature of 105 degrees Celsius.