A lot of companies out there make emergency evacuation sirens. Some of them are not that expensive, but the more popular ones tend to be quite pricey. However, for the average person, the price is worth it. With that said, people must understand the basics of what a siren sounds like and the proper way of using them.
The most common type of emergency siren is a two-tone emergency siren. This type of siren has a low pitch and high pitch designed for use during an emergency. For example, if you live in an area where there are wild animals in your neighborhood and have seen a large animal in the area, it is best to have this type of siren. You can also get the siren with a one-tone system, in which case it will alert the owner of the building. Either way, you need to know what you are doing with your emergency siren and use it properly.