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Amazon.com: SportDOG Brand TEK Series 1.5 GPS Tracking + E-Collar System - 7 Mile Range - Waterproof and Rechargeable - Tone, Vibration, and 99 Levels of Shock - Expandable to Locate and
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SportDOG Brand TEK Series 2.0 GPS Tracking Add-A-Dog Collar - Additional, Replacement, or Extra Tracking Collar - Waterproof and Rechargeable : Pet Supplies - Amazon.com
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