Product: Add-on or Replacement Electric Dog Fence Containment Collars - Compatible with Invisible Fence R21 Series Fences (10k Frequency - 2 Pack)
Brand: Perimeter Technologies
Replacement or Add-On Collar Receiver for Electric Dog Fence -

Collar comes set to progressively increase correction strength as your dog continues to approach the perimeter wire.
Fits necks from 10" to 26" around. Collar strap needs to be adjusted to fit, and then trim off the remainder of nylon strap. Use a glue or flame to ensure that the end of the nylon doesn't fray.
Lightweight and small profile to comfortably accommodate a wide variety of sizes of pooch.Get yours now!!

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