The ECS-200-10-36Q-ES-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 20 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 10 pF, Equivalent Series Resistance 60. Tags: Surface Mount. More details for ECS-200-10-36Q-ES-TR can be seen below.