The ECS-250-18-30B-AKM-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 25 MHz, Frequency Stability ±10 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 30. Tags: Surface Mount. More details for ECS-250-18-30B-AKM-TR can be seen below.