The ECS-120-18-5PVX-GN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 12 MHz, Frequency Stability ±30 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 60. Tags: Surface Mount. More details for ECS-120-18-5PVX-GN-TR can be seen below.