The ECS-102.4-18-5PXEN from ECS Inc. International is a RF Quartz Crystal with Frequency 10.24 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 50. Tags: Surface Mount. More details for ECS-102.4-18-5PXEN can be seen below.