The Perimeter Technologies Invisible Fence R21 Replacement Collar - 7K is a compact, reliable replacement for 700 Series systems, delivering trusted performance, a lightweight design, and long-lasting power. The 7K frequency is the most common, with PIR-003 10K available for installations experiencing frequency conflicts with neighboring systems.
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Series compatibility: Replacement collar for 700 Series Invisible Fence systems only; will not work with 800 Series or Titanium Series.
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Frequency compatibility: 7K is the most common frequency; PIR-003 10K used in installations experiencing frequency conflicts with neighboring containment systems.
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Not compatible with: Shields Indoor Avoidance transmitters.
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Fully compatible 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.
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Comfort and design: Patented Comfort Contacts cushion your dog’s neck in soft rubber.
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Omni Directional antenna: Patented 3-Way Omni Directional antenna design eliminates the “holes” found in lesser systems.
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Weight: 1.1 oz.
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Durability: Waterproof and submersible collar receiver design.
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Power: Long-lasting replaceable lithium-ion batteries.
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Quality and warranty: Designed and manufactured in the USA; Limited Lifetime warranty; 100% compatibility guaranteed.
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Value: A cost-effective alternative to the R21 that preserves Perimeter Technologies’ exclusive features and benefits. This replacement collar helps you keep your professionally installed fence functioning smoothly with a lightweight, weather-ready receiver, reliable power, and a design that emphasizes comfort and long-term durability. It pairs with a broad range of transmitters for flexible system upgrades, and the USA-made build with a Limited Lifetime warranty provides confidence and peace of mind for years of boundary training.
The benefits of this replacement collar include uninterrupted boundary training with a lightweight, weather-ready receiver you can trust outdoors. The patented Comfort Contacts and soft padding keep your dog comfortable during sessions, while the 1.1 oz weight minimizes distraction. Waterproof and submersible construction ensures reliable performance in wet conditions. With long-lasting replaceable lithium-ion batteries, you’ll spend less time on replacements, and the wide range of compatible transmitters provides flexibility for system upgrades without changing collars. Made in the USA and backed by a Limited Lifetime warranty, this replacement collar offers durable, dependable operation for years of boundary training.
