The ECS-20.48-12-1X from ECS Inc. International is a RF Quartz Crystal with Frequency 2.048 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 12 pF, Equivalent Series Resistance 500. Tags: Thru Hole. More details for ECS-20.48-12-1X can be seen below.