The ECS-135.60-18-30B-AGN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 13.56 MHz, Frequency Stability ±30 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 80. Tags: Surface Mount. More details for ECS-135.60-18-30B-AGN-TR can be seen below.