If you’re using an access fob for your condo or apartment, you may have wondered: How secure is it? Does it transmit all the time? Can I block its signal? The good news is that it is fairly secure, but if you’re still worried, or want an extra layer of protection to it, you can create a DIY blocker using common materials.
Below, we’ll walk through how to make a basic key fob blocker, why it works, and when it’s especially useful. For more on how to stop a fob transmitting or how to protect against RFID theft, see our related posts.
Why Make a DIY Fob Blocker?
Most apartment or building access fobs are passive RFID devices. They don’t broadcast a signal constantly — they only respond when a reader energizes them nearby. Still, having a barrier around the fob helps prevent unintended reads, keeps your spare key secure, and gives you peace of mind.
What You’ll Need
- A small piece of metal container or tin (e.g., empty Altoids™‐style tin)
- Aluminium foil, enough to line the inside
- Foam or fabric padding (optional, to cushion the fob)
- Tape or adhesive
The goal is to create a homemade Faraday shield that blocks RFID signals.
How to Build It
- Prepare the metal box
Clean out the empty tin or container and make sure the lid still closes snugly. - Line with aluminium foil
Cut a sheet of foil large enough to line the inner bottom and walls of the container. Press it flat so there are few air gaps. - Add padding (optional)
Place a small piece of foam or fabric inside the container (on top of the foil) so the fob doesn’t rattle and stays protected. - Seal or tape the edges
Use clear tape along the lid seam to ensure the enclosure remains fully “closed” when not in use. - Test the shield
Put your fob inside the container and try to scan it at the building reader. If the reader does not detect the fob, the shield works correctly.
When to Use It
- When you’re traveling or leaving your fob unused for a while
- For a spare fob that you rarely use and want to store securely
- If you want extra protection in shared living spaces
- Anytime you want peace of mind your fob won’t be accidentally scanned
Final Thoughts: Make Your Own Key Fob Blocker (Apartment Fob Edition)
We hope this simple DIY project helps you adding security without spending much. It won’t replace good access practices, but it gives you an easy tool for extra protection. If you ever need a spare fob made or duplicate service, we’re here to help! Check out our store locator and start your key fob copy journey today.
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