The ECS-260-10-30BQZ-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 26 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±15 ppm, Load Capacitance 10 pF, Equivalent Series Resistance 90. Tags: Surface Mount. More details for ECS-260-10-30BQZ-TR can be seen below.