Rechargeable In-Ground Fence - No Wire

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4 levels of static correction adjustable to pet's temperament, plus tone-only mode for training Rechargeable waterproof receiver collar with low-battery indicator Each charge lasts up to 2 months Transmitter is powered to cover up to 25 acres with additional wire and flags (sold separately)* Supports multiple pets as long as they are wearing a compatible receiver collar The receiver collar works with pets over 5 pounds with neck sizes from 6 inches to 26 inches Surge protector is included, helping to protect the transmitter from lightning strikes and power surges Anti-linger prevention Progressive "run-through" prevention