The ECS-250-20-1X-EM from ECS Inc. International is a RF Quartz Crystal with Frequency 25 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 20. Tags: Thru Hole. More details for ECS-250-20-1X-EM can be seen below.