Product Review

Replacement battery for Invisible Fence R21 and R51 Made in the USA Works with all R21 & R51 fence systems This does NOT go with "compatible" collars, this is for invisible fence brand only Replaces battery inside invisible fence brand name collars. Pet Stop Powercap(R) Replacement battery for Invisible Fence(R) R21 and R51 electronic dog fence collar receivers. This battery was designed by the former Chief Engineer at Invisible Fence Company. This battery was designed and built in the United States of America just like all Perimeter Technologies products.