The CLU046-1818C1-503M2G2 is a type of quartz crystal unit manufactured by Citizen, one of the largest crystal component suppliers in the world. It is a compact, surface-mount component that is designed to generate an ultra-stable and precise frequency across a wide temperature range. It also features excellent frequency stability and superior environmental performance, making it ideal for most modern electronic designs. The component is made up of a frequency control element, oscillator circuit, and a metal base, and it is housed in a small, lightweight plastic package. It operates over a wide temperature range, from -20°C to 70°C, and can operate for extended periods without maintenance or adjustment.