Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars by Perimeter Technologies Perimeter Technologies R21 Compatible Collar Fusion technology for maximum forgiveness:

Fusion technology for maximum forgiveness: fuses a titanium exo-cage with an ultralight triaxial carbon crown and sole to create forgiveness and stability

and full-array local dimming technology

Made in Italy

The double wall Vacuum insulation will keep liquids icy cold for up to 24 hours while hot liquids remain steaming hot for up to 6

Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars by Perimeter Technologies Perimeter Technologies R21 Compatible Collar Fusion technology for maximum forgiveness:Brand: 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: batteries Package Dimensions: 3. 6 x 2. 3 x 1. 0 inches