The CX4 EXT from IQD Frequency Products is a RF Quartz Crystal with Frequency 600 kHz to 2.5 MHz, Frequency Tolerance ±500 to ±10, 000 ppm, Drive Power Level 3 µW, Load Capacitance 7 pF, Shunt Capacitance 1 pF. Tags: Ceramic. More details for CX4 EXT can be seen below.