The ECS-31X from ECS Inc. International is a RF Quartz Crystal with Frequency 30 to 150 kHz, Frequency Tolerance ±30 ppm, Drive Power Level 1 µW, Load Capacitance 12.5 pF, Shunt Capacitance 0.8 to 1.7 pF. Tags: Thru Hole. More details for ECS-31X can be seen below.