Wholesalers and manufacturers of burglar alarms are present in Columbus. A burglar alarm is essentially a system designed to detect unauthorized entry into a building or area. Many of these alarms work on the principle of emitting a high pitched, loud noise when someone attempts to break into the building. They comprise an array of sensors, a control panel and alerting system, and interconnections. Detection of forced entry can be done by monitoring doors and windows by motion detectors, ultrasound, vibration, electric or magnetic fields, or microwaves. There are many different types of alarms available, and they are manufactured in Columbus. One can buy these systems in bulk from wholesalers at lower than retail rates.