The ECS-184-18-1X from ECS Inc. International is a RF Quartz Crystal with Frequency 18.432 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 20. Tags: Thru Hole. More details for ECS-184-18-1X can be seen below.