Perimeter R21 7K Replacement Collar – Invisible Fence Compatible

Perimeter R21 7K Replacement Collar – Invisible Fence Compatible

The Perimeter R21 7K Replacement Collar is designed as a reliable, fully compatible alternative for 700-series Invisible Fence® systems. The 7K frequency is the standard operating frequency for most installations, offering stable and consistent performance for everyday containment needs.

This collar provides a dependable replacement for lost or aging receivers while adding several comfort and safety enhancements.

Key Features

• Standard 7K frequency used in most Invisible Fence® installations
• Comfort Contact™ soft rubber probes for a gentler, more comfortable fit
• Three-way omni-directional antenna for improved boundary detection
• Waterproof and submersible receiver for dependable outdoor use
• Progressive stimulation adapts correction intensity based on your dog’s movement and behavior
• Lightweight design (1.1 oz) for comfortable daily wear
• Replaceable long-life lithium-ion batteries
• Limited lifetime warranty
• Designed and manufactured in the USA

System Compatibility

Compatible with Invisible Fence® 700-Series systems, including:
 ICT-700, ICT-725, ICT-750, ICT-775, ICT-150, ICT-250, ICT-100, ICT-75, ICT-50, AT-950 Indoor Transmitter, CT-4000

Not compatible with:
 – 800-Series and later Invisible Fence® systems
 – Titanium Series
 – Shields™ Indoor Avoidance transmitters

Why This Collar Helps

This replacement collar offers stable performance, enhanced comfort, and a lightweight, waterproof design, giving dog owners a reliable way to maintain secure containment without sacrificing fit or durability. The 7K frequency ensures smooth interaction with most standard systems, making it a practical replacement choice for 700-series Invisible Fence® installations.