This is a 15pF ±2% 500V ceramic capacitor with the designation CER 15PF 500V C0G/NP0 1111. It has a capacitance value of 15 pF and can withstand voltages up to 500 volts. The capacitor meets the specifications for C0G, NP0 (1B) type, identified by the code 2828 Metric.