AdThe all-new Halo Collar 4: The safest GPS fence with unbeatable accuracy and tracking. New Halo Collar 4: The world’s safest GPS dog fence, now with with dual-frequency GPS.

AdEasy to Use & Setup. Customizable Buzz, Vibrate, Beep Modes. Waterproof. Durable. Compact. Top 5 Wireless Fence Receiver Collars. For Multiple Dogs. For Small Dogs. For Large Dogs.