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They are the important devices largely used to send signals in various fields like transport, irrigation, industrial etc. They vary in their application like for audible, visible signaling etc. Visible signal devices largely adopted for the traffic control for road and rails as wayside signaling int ermediate / approach signals. They can be used as a means of security and safety for cranes and conveyors, where signals can be both seen and heard. For audible signaling purpose devices like vibrating and single stroke bells that sound a unique tone. They are ideal for industrial, hospital applications. Outdoor warning systems are ideal for mines, refineries, chemical plants etc. Telephonic signals are popular devices ideal for factories and foundries, printing plants etc. Contact devices are widely used for commercial and OEM applications. Electro-magnetic buzzers are popular audible signal device; produce no arcing, electrical noise, or mechanical wear during operation. They are more reliable and operate more consistently during their operating life and are able to produce many more types of tones compared to other systems. A wide range of signaling device is manufactured by a host of companies.
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