The B12000J233 is an HC-49S dual inline package (DIP) crystal resonator with a frequency of 12MHz and a temperature stability of ±20ppm (parts per million). It is manufactured by East Crystal and is RoHS compliant. The resonator is used for timekeeping, frequency control, and/or signal manipulation in electronic devices. It is often found in computers, mobile phones, GPS systems, and other electronic circuitry. The resonator can be soldered directly onto a circuit board. It has a vibration and shock resistant design and is highly heat tolerant, allowing it to be used in a wide range of applications.