Halo Collar 5
Pros and Cons
Pros
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PrecisionGPS analyzes 20 location updates per second
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Always-on real-time tracking with no low-power modes
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Up to 48-hour battery life
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GPS fences stored on the collar work without Wi-Fi or cell service
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Fits necks from 8 to 30 inches
Cons
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Requires a paid monthly subscription
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Expensive up front
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Not recommended for dogs under 10 pounds