The CSM-4AX from ECS Inc. International is a RF Quartz Crystal with Frequency 3.57 to 30 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Drive Power Level 500 µW, Load Capacitance 10 to 20 pF. Tags: Surface Mount. More details for CSM-4AX can be seen below.