I was looking through google images for a radio shack 120v alarm when I saw a gem. It was a link to Alibaba for an electronic* siren with the amazing caption "Alarm Siren 140db 120v Siren-Buy Alarm Siren Motorcycle Siren 125db Siren 120v Alarm Siren Produ..." it just ends there. It is quite strange that the siren advertises 2 different decibel ratings but ¯\_(ツ)_/¯.
*I don't know, see for yourself.
EDIT: HOW IS IT POSSIBLE THAT THIS TINY BOX IS LOUDER THAN THE CHRYSLER