The X322520MSB4SI is a ceramic surface mount crystal resonator made by the Yangxing company. It has a frequency of 20 MHz and an accuracy of ±10ppm, and is RoHS-compliant. The resonator is 3225-4P SMD, with 4 pins in a small form factor that is designed for easy surface-mounting. The device is highly stable, with good temperature characteristics that enable frequencies to remain reliable over long periods of time. It is well-suited for applications that require high frequency accuracy, such as frequency control in communication systems, computer chipsets, and LCD monitors.