I give to you the Becker Sinfo siren. When i saw that @Kemro released the old german lightbar mod i was thrilled. I remembered that i had this siren mod just lying somewhere in my computer, so i "remastered" it and made it work.
Hope you enjoy it!
Credits: https://www.gta5-mods.com/vehicles/german-becker-sinfo-siren-90-s

Becker Sinfo 90s Polizei siren 1.0
The siren that the german police used in the 90s