The ECS-1.536-12.5-13X from ECS Inc. International is a RF Quartz Crystal with Frequency 153.6 kHz, Frequency Tolerance ±30 ppm, Load Capacitance 12.5 pF, Equivalent Series Resistance 50000, Operating Temperature -10 to 60 Degree C. Tags: Thru Hole. More details for ECS-1.536-12.5-13X can be seen below.