Perimeter Technologies Invisible Fence R21 Replacement Collar - 7K
Perimeter Technologies Invisible Fence R21 Replacement Collar - 7K
Spacious, weatherproof design built for comfort, durability, and everyday use.
✔ Fast U.S. Shipping (3–7 Days)
✔ Secure Checkout Guaranteed
✔ Trusted U.S. Supplier
✔ Durable Weather-Resistant Build
Couldn't load pickup availability
🔥 Limited Stock – Selling Fast
Your dog's containment system is only as reliable as the collar it runs on — don't let a worn-out receiver put your dog at risk.
This Perimeter Technologies replacement collar is fully compatible with Invisible Fence R21 systems using 7K frequency. It's a direct drop-in replacement — same fit, same signal, same reliable containment — so you can restore your existing system without replacing the whole fence. Waterproof and built for daily outdoor use, it keeps your dog safely contained without the cost of a full system upgrade.
If your current R21 collar is damaged, worn, or lost, this is the exact replacement you need to get your containment system back up and running fast.
- Compatible with Invisible Fence R21 systems — 7K frequency, direct replacement
- No new fence installation needed — works with your existing boundary wire
- Waterproof construction — built for daily outdoor use in all weather
- Rechargeable battery — no disposable batteries to replace
- Adjustable fit — fits a wide range of dog neck sizes
Specifications:
- Compatible system: Invisible Fence R21
- Frequency: 7K
- Waterproof: Yes
- Battery: Rechargeable
- Fits neck sizes: 6"–28"
Ideal For:
- R21 system owners replacing a worn or damaged collar
- Multi-dog households needing a second R21 receiver
- Anyone restoring an existing Invisible Fence system
- Dogs of all sizes with R21-compatible fences
