The HC49/4HSMX AUTO from IQD Frequency Products is a RF Quartz Crystal with Frequency 3.01 to 100 MHz, Frequency Stability ±15 to ±100 ppm, Frequency Tolerance ±10 to ±50 ppm, Drive Power Level 50 µW, Load Capacitance 10 to 75 pF. Tags: Surface Mount. More details for HC49/4HSMX AUTO can be seen below.