A system for producing a sound having a certain frequency range to maintain laying hens in stable and comfortable conditions. The first entity sends a request for an operation associated with the second entity. The job site communications system can include a wireless communications device adapted to be positioned at a job site and operable to wirelessly communicate annotated computer-aided design documents from the job site. A third data file contains information about each of the variables. In addition, if the calibration and self diagnosis of the radar are periodically performed by using at least one of the reflectors, it is possible to maintain the performance of the radar in an optimal state.