The CAP ALUM POLY 1200UF 20 4V SMD is a type of capacitor that has several key characteristics. It features a high capacitance value of 1200 microfarads, operates at a voltage rating of four volts, and utilizes an aluminum-polymer electrolyte. This component is surface mountable (SMD) and comes in a radial, can design. Additionally, it boasts low resistance with an ESR (equivalent series resistance) of approximately twelve milliohms. The capacitor has been tested to withstand temperatures up to 105 degrees Celsius for two thousand hours without failing.