Atlanta has wholesalers and manufacturers of burglar alarms. 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. The connections used may be wired and wireless. Video systems can also be used to literally keep an eye on the property. Once an alarm is reported to the monitoring center, it can respond in a number of ways. One can be calling a list of phone numbers provided by the customer to enable someone to check the premises. Others may call the police, the fire department or the EMS. There are many different types of alarms available, and they are manufactured in Atlanta. One can buy these systems in bulk from wholesalers at lower than retail rates.