The CAP ALUM POLY 560UF 20 4V SMD is a type of capacitor that combines aluminum and polymer materials. It has a capacitance value of 560 microfarads, an operating voltage of 4 volts, and is designed in surface-mount technology (SMT) for compact use on printed circuit boards. The radial lead design with a metal can enclosure allows for easy handling and connection. This capacitor features low resistance at 14 milliohms and has a high reliability rating, withstanding up to 2000 hours of operation at an elevated temperature of 105 degrees Celsius.