Perimeter Technology - R21 Invisible Fence Compatible Dog Collar - 7K Frequency

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-4001

NOT COMPATIBLE - These collars will NOT work with Invisible Fence 800 Series Systems or later fences (including the Titanium Series). Will NOT work with Boundaries Plus Fence. Nor will it 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 in the United States with imported parts

WATERPROOF COLLAR RECEIVER - The craftsmanship that goes into every Perimeter brand dog fence is so good they offer the only battery replaceable waterproof collar receiver on the market. Perimeter brand receivers will continue to function without issue when completely submerged in water.