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I used these keychain rape alarms from GE. They have a keyring on either end and you just pull the one keychain out. It makes a pretty loud warble but not smoke detector loud.
I painted them camo and use braided camo spider fishline to anchor them. The amount of force needed to pull the pin is minimal so even smaller animals may trigger the alarm.
They are NOT waterproof and can go off when wet.
Buy them from Lowes, Home Depot, Amazon