The 1ZCM20000EE0A is an SMD Crystal Resonator manufactured by KDS with a frequency of 20MHz, and a tolerance of ±50ppm. It is a small, 3225 size surface-mount device (SMD) made up of a quartz crystal enclosed in a package that can be soldered onto a circuit board. It is RoHS compliant, meaning that it is compliant with the Restriction of Hazardous Substances (RoHS) Directive limitations for hazardous materials, which require reductions in the levels of lead, mercury, cadmium, and other materials used in consumer electronics.