The CFS20632768HZF with Radial Cylinder Crystals Radial,2x6mm RoHS by CITIZEN is an electronic component type categorizing as a radio frequency (RF) quartz crystal. This component is a miniature mechanical resonator composed of a quartz slice which is tuned to a specific frequency, typically used to control the frequency of an oscillator in construction of various electronics circuits such as microprocessors, radios, and clocks. The CFS20632768HZF has a frequency of 20.632768 MHz and a package size of 2 x 6mm in accordance to Restriction of Hazardous Substances (RoHS) Directive 2002/95/EC, meaning it is free from hazardous materials.