The ECS-160-20-30B-AEM-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 16 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 50. Tags: Surface Mount. More details for ECS-160-20-30B-AEM-TR can be seen below.