The electronic part 49SAC22118202040 with DIP Crystal Resonators HC-49S RoHS is a precision quartz crystal manufactured by JGHC. It is a dual in-line package (DIP) capable of being mounted on a standard two-hole board. This component has a frequency range of 18.118 MHz and 20.040 MHz and is RoHS compliant ( Restriction of Hazardous Substances). It is commonly used in consumer electronics, such as TV sets, digital clocks, phones, and computers, as it provides a stable frequency used to control the timing of electrical signals.