The ECS-250-10-36B-CTN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 25 MHz, Frequency Stability ±20 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 10 pF, Equivalent Series Resistance 50. Tags: Surface Mount. More details for ECS-250-10-36B-CTN-TR can be seen below.