The ECS-240-18-30B-CHN-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 24 MHz, Frequency Stability ±25 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 30. Tags: Surface Mount. More details for ECS-240-18-30B-CHN-TR can be seen below.