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Amazon.com: SportDOG Brand FieldTrainer 425X/SportHunter 825 Add-A-Dog Collar-Additional, Replacement or Extra Collar for Your Remote Trainer-Waterproof and Rechargeable with Tone, Vibration and Static : Pet Supplies
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Amazon.com: SportDOG Brand SportTrainer Remote Trainers - Bright, Easy to Read OLED Screen - Waterproof, Rechargeable Dog Training Collar with Tone, Vibration, and Static, 3/4 Mile Range - 6 Dog Expandable : Everything Else
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