Whelen Sirens

WS 1000
Mostly a set of public address speakers.
Sample video: https://www.youtube.com/watch?v=RcQSfnIw1AU

WS 2000
Has a pretty similar appearance to Federal Signal's DSA and ACA's AL-8000.
Sample video: https://www.youtube.com/watch?v=yGWDPB2ZZK0

WS 3000
Much closer to what they'd continue making, but with 16 throats instead of 4 or 8.
Sample video: https://www.youtube.com/watch?v=cIeOiDrUX6I

WS 4000/R4/Vortex
Largely identical, except for the rotator mechanism
Sample video: https://www.youtube.com/watch?v=QNZfK3DeoeY

2800 Series
Black with a set of speaker drivers available from 1-10 that could each be removed if a driver had died or otherwise didn't work. Quite common across the United States and prone to malfunctioning. Has similarities to Federal Signal's Modulator series, runs on battery backup
Sample video: https://www.youtube.com/watch?v=w-jYm6WF9Ec

2900 Series
Basically an updated version of the 2800 series.
Sample video: https://www.youtube.com/watch?v=03bTBoCZuaQ

Omni-Alert
Mostly just the 2800 or 2900 series with 1-4 drivers for fire stations.
Sample video: https://www.youtube.com/watch?v=ezv_sNhJiWI

Hornet
A bell-shaped siren with 1 speaker driver, oscillates like the company's other rotating sirens
Sample video: https://www.youtube.com/watch?v=C3-JBHpLg-w