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Amazon.com: SportDOG Brand TEK Series 1.5 GPS Tracking System - 7 Mile Range - Waterproof and Rechargeable - Expandable to Locate up to 12 Dogs : Pet Supplies
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Amazon.com: SportDOG Brand TEK Series 2.0 GPS Tracking System - 10 Mile Range - Waterproof and Rechargeable - Expandable to Locate up to 21 Dogs - Unlimited, Lifetime Map Updates : Pet Supplies
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