The ECX-53BQZ from ECS Inc. International is a RF Quartz Crystal with Frequency 13 to 26 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±15 ppm, Drive Power Level 10 to 100 µW, Load Capacitance 10 pF. Tags: Surface Mount. More details for ECX-53BQZ can be seen below.