If an electromagnetic pulse (EMP) occurs, most people will remain completely unaware. Only as they discover that many of their modern electronics stopped functioning, will they begin to suspect that something is wrong. The DEFCON™ EMP Alert System is designed to detect electrical disturbances resulting from an electromagnetic pulse or a solar coronal mass ejection (CME). This device monitors the power lines and ambient air for damaging disturbances. Once detected, the DEFCON™ EMP Alert System provides audible warnings so that additional protective steps can be taken, such as opening the main circuit breaker to prevent home damage.