How Do Microchip Cat Flaps Work? Everything You Need to Know

If you're looking for the safest and smartest way to let your pet in and out of your home, a microchip cat flap might be just what you need. These high-tech flaps offer convenience, security, and peace of mind — but how do they actually work, and what should you consider before installing one? Let’s break it down.

What Is a Microchip Cat Flap?

A microchip cat flap is a pet door that only unlocks for animals whose microchip numbers are stored in the device. Instead of using a collar key or leaving the flap unlocked, your cat’s microchip acts like a unique key that triggers the flap to open.

How It Works

• Your cat’s microchip (usually implanted between their shoulder blades) emits a low radio frequency code.
• The flap reads this code when your pet approaches.
• If the chip matches one of the stored IDs, the door unlocks automatically.
• After a few seconds, it locks again until another recognised chip is detected.

Some advanced models even let you:

• Control settings via an app
• Set curfews
• Track which pet has entered or exited

Benefits of a Microchip Cat Flap

• Intruder-proof: Keeps out strays, foxes, and neighbouring pets
• No collar needed: Great for cats who refuse or lose collars
• Multi-pet access: Store up to 30+ microchip IDs
• Increased control: Many models allow timed or one-way access
• Peace of mind: Know only your pet can enter

Things to Consider Before Buying

• Microchip Compatibility: Most flaps support 15-digit ISO microchips, but always check with your vet and the product specs
• Power source: Some use batteries, others are mains powered
• Size: Choose the right flap size for your cat or small dog
• Glass or wall fitting: Make sure the flap is compatible with your door or wall material

Can You Use a Microchip Cat Flap for Dogs?

Some small dog breeds can use microchip flaps designed for cats. However, for larger dogs, you may need a different type of smart door with RFID collar tags instead of microchip scanning.

Installation Tips

• Position the flap at the right height (usually low belly height of your pet)
• Ensure there's no metal directly around the flap that could interfere with signal
• Use adapter kits for wall or glass installations

Final Thoughts

Microchip cat flaps are a secure, modern solution for giving your pet freedom without compromising on safety. They’re especially ideal for multi-pet homes or areas where strays and wildlife are a concern. Need help choosing the right one? Browse our full range of microchip cat flaps at catflaps.co.uk — we’re always happy to help!

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