Perimeter Technologies, a leading manufacturer of electronic pet fencing, has designed a cost effective alternative to the once exclusive Invisible Fence® R21 Fence dog fence collar, providing owners of the nation’s largest and best known professionally installed dog fence brand a significant savings on their replacement collar receivers.

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 MANUFACURED in the USA
• Limited Lifetime warranty
• You save!
• 100% compatibility – guaranteed!

This replacement collar receiver 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

Please indicate 7K or 10K frequency when ordering. 7K is the most common frequency, the 10K was used in installations experiencing frequency conflicts with neighboring containment systems. 

Lionsco Pet Products ships to US and Canada. Most orders ship in 1-2 business days. Allow 3-7 days for standard ground delivery to arrive to your door, (allow longer for Alaska, Hawaii and Canada).  You will receive an email confirmation when you place your order. In a few days when your order ships your will receive a second email with the tracking number.  

Products that display "Ships Free" are free shipping for standard ground service to the continental United States only.  Shipping to Canada, Alaska and Hawaii do not qualify for free shipping.  Rest assure, before you enter any personal information you will see your final cost including shipping when you view your cart and click on "estimate shipping" .  

Additional rates for orders shipping to Alaska and Hawaii .  Rates will not be calculated when you check out, you may contact us for shipping cost or check out and we will contact you with the shipping fees for your approval. 

Have a question please do not hesitate to contact us at our toll free number 866-480-0715