The CAP CER 390PF 4KV X7R 1825 is a ceramic capacitor with specific properties. It has a capacitance value of 390 pF and tolerates ±20% variation, while it can withstand a voltage of 4000V (4kV). The designation X7R indicates its temperature coefficient and the metric code 4564 refers to its package size, which corresponds to the 1825 designation.