Fan relay boards are provided that include terminals configured to receive line power of approximately 115 volts, 208 volts, 230 volts, and 277 volts. The method includes the steps of receiving from a user a selection of video clips to be made into the finished video presentation, automatically trimming the selected video clips, and automatically assembling the trimmed video clips into the finished presentation. The present invention could provide products with high-quality and high production capacity, which are stable in performance, therefore is reliable and free from contamination. As said structure of above mentioned method is employed by the radio frequency module, monitoring method according to this structure is able to automatically debugging and testing by using tools such as computer, thus improving the production efficiency. The sacrificial layer can also be a polymer layer with the polymer layer being removed to form the gap using an O2 plasma etching process.