The CAP CER 3900PF 2KV X7R 1210 is a ceramic capacitor with the following specifications: capacitance of 3900 picoFarads ±10%, and a voltage rating of 2000 volts (2kV). It has an X7R temperature coefficient, making it suitable for various applications. The capacitor is packaged in the 1210 metric case size, equivalent to the 3225 measurement in imperial units.