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Bell boxes are one of the components in sirens and horns, car alarm, smoke and gas detectors, etc. The air horns or sirens are warning signals attached in alarms. Horns or bell boxes are available according to variety of applications. Automobile horns are found in vehicles, sports events, etc. A trumpet creates a similar sound and is similarly used. This safety equipment is used in various sectors of an industry. In a control panel unit, the siren works in co ordination with all other alarms. There are many signaling devices installed in an industry- fire detector, smoke and gas detectors, safety bumpers, security cameras, etc that have a horn or siren. Sirens are also attached to doors top inspect on the employees and outsiders. Sirens are used for emergency and attached to police cars and ambulances, factories, airways and maritime areas. Bell boxes are found in doorbells, telephone and mobile phones.
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