The ECS-160-20-5PX-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 16 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 40. Tags: Surface Mount. More details for ECS-160-20-5PX-TR can be seen below.