Perimeter Technologies Electric Dog Fence R21 Replacement Collar 7K (2 Pack) - Compatible with Invisible Fence Brand Systems - with Backup Collar Strap Bundle - Extreme Dog Fence

• UPC   751354551242
• INVISIBLE FENCE COMPATIBLE - This Collar Will Work with Invisible Fence Brand Inground Fences Prior to the 800 Series, Including ICT-700, ICT-725, ICT-750, ICT-775, ICT-150, ICT-250, ICT-100, ICT-75, ICT-50, AT-950 Indoor Transmitter, CT-4002 NOT COMPATIBLE - These Collars Will NOT Work with Invisible Fence 800 Series Systems or Later Fence (Including the Titanium Series). . Will NOT work with Boundaries Plus Fence. Nor Will They Work With the Shields Indoor Avoidance Transmitters FREQUENCY SELECTION - Most Invisible Fence Brand Underground Fence Systems Run on 7K, by Default. Systems that were Setup with Neighboring Fence Systems in Place May Run on 10K, to Avoid Interference AMERICAN MANUFACTURED - This Collar is Proudly Manufactured Right Here in the U.S.A. with a History of Dependability Behind it