Capacitor, aluminum-polymer type, part number CAP ALUM POLY 330UF 20, with a capacitance of 330 microfarads and a voltage rating of 2.5 volts, in surface-mount (SMD) package, metric size 2917 or 7343 equivalent, having an ESR of approximately six milliohms, and a lifespan of 2000 hours at 105 degrees Celsius.