The ECX-39 from ECS Inc. International is a RF Quartz Crystal with Frequency 32.768 KHz, Frequency Tolerance ±20 ppm, Drive Power Level 0.1 to 1 µW, Load Capacitance 12.5 pF, Shunt Capacitance 1.33 pF. Tags: Surface Mount. More details for ECX-39 can be seen below.