This is a ceramic capacitor with the following specifications: CAP CER 0.1UF 250V X7R 1812 refers to its designation, which includes the type of capacitor (ceramic), capacitance value (0.1 microfarads or µF), voltage rating (250 volts), and temperature coefficient class (X7R). The 1812 in this designation corresponds to the metric size of the capacitor, equivalent to the imperial size 4532.