Federal Signal 3T22

It can produce two main signals (it can produce more but the other signals are rarely used), hence the name "2T22" (the 2 at front representing the 2 choppers, and the 22 representing the amount of horns).

The 3T22 is superior in design because it can perform the "hi-lo" signal, which is mainly used for fire calls.

In the early 1990s, the siren's production was stopped when it was replaced with the newer 2001-SRN, which can reach 126db (also measured 100 feet away), hence the name.

It also has a smaller cone on top to reduce rain and other water-related substances such as snow from getting inside.

The siren has a small stand with three legs so it can be mounted on a pole or roof.