This is a CAP CER 12PF 500V C0G/NP0 0805 - ceramic capacitor with a capacitance value of 12 pF and an operating voltage of 500 volts. It conforms to the C0G or NP0 specification, a type of ceramic dielectric material known for its stability and reliability, and has a metric case size of 0805 (2012 in imperial measurements).