Add another dog to your current SportDOG Brand In-Ground Fence system (SDF-100A) or replace a Collar Receiver with the SDF-R Add-A-Dog Receiver. The In-Ground Fence is expandable to any number of dogs over 10 pounds. Contents: Collar Receiver, Long Contact Points, Operating Guide, and Test Light . For dogs over 10 pounds Stimulation Levels: 4 Anti-Linger Feature prevents dog from running down Collar Receiver battery in warning zone Battery type: replacement 9-volt
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