PetSafe Stubborn Dog In-Ground Fence PRF-275-19 Receiver Collar, Nylon/Plastic, RedThis extra receiver collar can be used to add another dog to any PetSafe in to ground fence system or as a replacement collar to the Stubborn Dog In to Ground Fence (PIG00 to 10777 or PIG23 to 10682). The collar features 4 levels of static correction at a higher intensity especially for stubborn or hard to train dogs. Unit: EA UPC: 729849105195 Model Number: PRF 275 19