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Synergy Digital Dog Collar Battery, Compatible with SportDOG TEK 2.0 GPS Collar Dog Collar, (Li-Pol, 3.7V, 1600mAh) Ultra High Capacity, Replacement for SportDOG V2GBATT Battery - Walmart.com
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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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