The ECS-135.6-8-30B-CKM from ECS Inc. International is a RF Quartz Crystal with Frequency 13.56 MHz, Frequency Stability ±10 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 8 pF, Equivalent Series Resistance 80. Tags: Surface Mount. More details for ECS-135.6-8-30B-CKM can be seen below.