you might consider the cass creek callers, they are inexpensive and work very well. I don't have mine in front of me but will say it's the nomad mx4, it comes with a remote so you can get away from it, and there is a optional loud speaker that i swear you can hear in the next county. So far the battery life seems to be pretty good. If i remember right it's casscreek.com hope that gets you there. blue
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