Self-adjusting Speaker Style Alarm

Self-adjusting alarm uses an actual built in micro-phone to sense ambient noise and automatically adjusts the output sound level to be 10 decibles above the ambient noise level, taking the guess work out of the sound level selection.  Some alarms use the speaker as a micro-phone which can distort sound and can miss some of the important lower frequencies occuring at a job-site.  Velvac's alarm uses a true, high sensitivity micro-phone positioned to pick up the noise around the alarm and not just in the area ebhind the vehicles.