The ECS-128-13-30B-AEM-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 12.8 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 13 pF, Equivalent Series Resistance 80. Tags: Surface Mount. More details for ECS-128-13-30B-AEM-TR can be seen below.