The CAP CER 2.1PF 25V C0G/NP0 01005 is a ceramic capacitor with specific characteristics. It has a capacitance value of 2.1 pF and a tolerance of ±0.25pF, making it suitable for use in various electronic applications at a voltage rating of 25 volts. The capacitor adheres to the C0G/NP0 specification, indicating its stability over temperature and frequency.