The ECS-260-12-37B-CKY-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 26 MHz, Frequency Stability ±10 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 12 pF, Equivalent Series Resistance 50. Tags: Surface Mount. More details for ECS-260-12-37B-CKY-TR can be seen below.