The ECS-120-20-1X-EM from ECS Inc. International is a RF Quartz Crystal with Frequency 12 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 30. Tags: Thru Hole. More details for ECS-120-20-1X-EM can be seen below.