Post your homemade or cardboard sirens here, I have made some too.
i aint got enough 
i did make an alarm at aschool for a tech peoject but its long gone lost
I’m sorry… It hurts losing a alarm
its ok
it was some modeled plastic with a speaker with a battery
How did you mold plastic
idk i forgot
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i have some cardboard and now i need some tansparrent plastic
(hint: im making one of the simples 2120’s alarms)
ill be afk cuz of h/w and stuff
pass the message on ig