The ECS-135.60-8-33-RWY-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 13.56 MHz, Frequency Stability ±15 ppm, Frequency Tolerance ±15 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 100. Tags: Surface Mount. More details for ECS-135.60-8-33-RWY-TR can be seen below.