Those replacement canine fence batteries fit all Invisible Fence Emblem R21, R51, or MicroLite electronic canine fence receiver collars. All Invisible Fence Pc Collar series fit, together with Titanium, Platinum, Graphite, and Mink versions. Works rather than PowerCap Battery.
Invisible Fence Emblem Compatible.
Works in R21, R22, R51, & Microlite Receivers.
Less Pricey than the unique.
Guaranteed to work.