The SportDOG SDF-R Extra Add-A-Dog Collar Receiver is designed specifically for use with the SportDOG SDF-100-100A In-Ground Fence system. This additional receiver allows you to expand your fence system to include another dog, providing a secure and reliable way to monitor and control your pets' movements. With the trusted SportDOG brand and compatibility with the SDF-100-100A model, you can trust that your furry friends will be safe and well-contained within your designated boundaries. Has a brand new 9v battery installed and ready for pairing. Comes with both sets of prong sizes
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