The ECS-120-12-36Q-CWY-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 12 MHz, Frequency Stability ±15 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 12 pF, Equivalent Series Resistance 150. Tags: Surface Mount. More details for ECS-120-12-36Q-CWY-TR can be seen below.