Replacement or Add-On Collar Receiver for Electric Dog Fence -<br><br>Collar comes set to progressively increase correction strength as your dog continues to approach the perimeter wire.<br>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.<br>Lightweight and small profile to comfortably accommodate a wide variety of sizes of pooch.<b>Get yours now!!</b>