Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) ProfessorZ Click on the Gorilla link

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displays 1/10-yard measurements

Good Combination of Speed

- Appropriate Height: 5'-5" to 6'-5"

Aluminum alloy powerful controller

Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) ProfessorZ Click on the Gorilla linkBrand: Perimeter Technologies Features: Pack of 4 batteries. The Perimeter Brand Invisible Fence Replacement Battery is the best solution for keeping your Invisible Fence Brand system operating safely. Compatible with R21, R22, or R51. Less Expensive than the original. Publisher: Perimeter Technologies Details: The Perimeter Brand Invisible Fence Replacement Battery is the best solution for keeping your Invisible Fence Brand system operating safely.