A high school campus in California undergoing a complete remodel, during over a year long construction, students have to move into temporary module buildings were set up on a large area of the campus. In order to prevent HVAC units theft and threat of vandalism, perimeter alarm solution was needed, such a system should cover a large area, also can be easy to install and remove if necessary. A local security integrator chose solar powered photoelectric beam sensor along with Wi-Fi + GSM alarm panels to provide the reliable, inexpensive yet effective way to protect the premises. The solar powered photoelectric beam detectors were deployed to secure the site, when people cross the defense line will set off the alarm, on-site guard will be alerted by strobe lights, also be notified by push notification and call, as well as text message.