This is a small, high-value ceramic capacitor with a capacitance of 1.2 picofarads and a tolerance of ±0.25 picofars. It has a voltage rating of 500V and a case size of 0805 (also known as 2012 metric). The C0G/NP0 designation indicates that it is a temperature-stable, ceramic capacitor suitable for use in a variety of applications where stability and reliability are critical.