Cheap Alteranative
Sounds are decent but somewhat "tin can". For about $40, I rigged it to my iPhone with a speaker amplifier (two 9-volt batteries) and a speaker. Decent set up and alternative to $450 for FoxPro game caller. Downside is I must be close to set-up unless I want to wrangle with a bunch of speaker wire. Could give it more stars if they would add a time delay start so I could set up farther away from the unit before I begin calling.
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Predator Hunting Calls