This is a CAP CER 15PF 3KV C0G/NP0 1812 ceramic capacitor with a capacitance of 15 pF and a tolerance of ±2. It has a working voltage of 3000V or 3kV and belongs to the C0G/NP0 class, which is commonly used in electronic applications due to its stable properties over temperature. The metric designation for this component is 4532.