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Operation on 3-volt lithium battery. Normal, Grouse, & silent modes. Single or double beep to distinguish between 2 dogs. One beep per second to signal when dog is on point. MODEL TB-100: Standard beeper, redesigned, low-profile speaker with a lower pitch audible out to 250 yards> Good, economy beeper for close-working pointing dogs. MODEL TB-250: Higher volume beeper, audible out to 400 yards. great value in mid-range beeper.
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