This is a CAP CER 150PF 500V C0G/NP0 1812 ceramic capacitor with specific capacitance and voltage ratings. It has a capacitance value of 150 pF and operates at a voltage of 500 volts. The C0G/NP0 designation indicates that it is a type of ceramic capacitor with a temperature coefficient of 0 parts per million, making it suitable for applications requiring stability over a wide temperature range.