.This is an SMD Crystal Resonator manufactured by Failong Crystal. It is a surface mount component that is 2.5 x 2.0 mm in size. It has a resonance frequency of 40MHz, tolerance of ±10 ppm, and is RoHS compliant. It is primarily used for oscillator circuits and clock signal generation, can be assembled with a reflow soldering process, and operates over a temperature range of -40°C to +85°C.