Reliability testing is an activity conducted to evaluate the functional reliability of a product during its specified lifespan, in all expected environments such as use, transportation, or storage. By using various environmental testing equipment to simulate high temperature, low temperature, high temperature, high humidity, and temperature changes in the climate environment, the reaction of the product in the usage environment is accelerated to verify whether it meets the expected quality goals in research and development, design, and manufacturing, and to evaluate the overall product to determine its reliability life.