The HC-49UX from ECS Inc. International is a RF Quartz Crystal with Frequency 1.8 to 100 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Drive Power Level 1 µW, Load Capacitance 10 to 20 pF. Tags: Thru Hole. More details for HC-49UX can be seen below.