The HC-49USX from ECS Inc. International is a RF Quartz Crystal with Frequency 3.5 to 70 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Drive Power Level 500 µW, Load Capacitance 10 to 20 pF. Tags: Thru Hole. More details for HC-49USX can be seen below.