"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 .Features:
- 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