*Ships ONLY within the United States*  

Don’t be fooled by the low aftermarket price. Perimeter Technologies®️ is a brand you can trust with products that are loaded with exclusive features and benefits not found in the original. As a matter of fact, Perimeter Technologies' President is the same person that founded Invisible Fence brand back in 1976!

Compare Perimeter Technologies®️  with your current R21:

• PATENTED Comfort Contacts cushion your dog’s neck in soft rubber
• PATENTED 3-Way, Omni-Directional antenna design eliminates the “holes” found in lesser pet fencing systems
• WATERPROOF and submersible collar receiver design
• PROGRESSIVE STIMULATION allows your dog to choose the fence level that is right for their personality
• ULTRA-SMALL and light weight collar design is a mere 1.1 oz!
• LONG-LASTING replaceable lithium ion batteries
• DESIGNED and MANUFACTURED in the USA
• Limited Lifetime warranty
• You save!
• 100% compatibility – guaranteed!

This replacement collar receiver is for 700 Series Invisible Fence®️  systems only and will not work with 800 series or later, including new Titanium Series. The Perimeter®️  collar is not compatible with Shields Indoor Avoidance transmitters.

FULLY COMPATIBLE WITH THE FOLLOWING INVISIBLE FENCE®️  BRAND TRANSMITTERS:

ICT-700, ICT-725, ICT-750, ICT-775, ICT-150, ICT-250, ICT-100, ICT-75, ICT-50, AT-950 Indoor transmitter, CT-4000