What Is a Proximity Card and Which One Do I Need?
If you manage a building, school, or facility, you have probably asked this question at some point:
"What proximity card do I need to order?"
It is one of the most common questions buyers have, especially when replacing cards or trying to save money on branded systems. This guide will walk you through exactly what proximity cards are, how they work, and how to choose the right one for your system.
---What Is a Proximity Card?
A proximity card, often called a "prox card," is a contactless access card that uses RFID technology. Instead of swiping or inserting the card, you simply hold it near a reader to unlock doors or gain access.
Most proximity cards operate at 125 kHz and are used in:
- Office buildings
- Schools and universities
- Healthcare facilities
- Gated communities
- Commercial properties
Why Most Buyers Are Reordering (Not Starting From Scratch)
Here is the reality: most customers are not buying proximity cards for a new system.
They are asking:
"I already have cards... I just need more. What do I reorder?"
This is where compatibility matters.
Instead of paying premium prices for original branded cards, many buyers switch to compatible proximity cards that work the same way with their system.
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What You Need to Know Before Ordering
To make sure your cards work correctly, you need three key pieces of information:
1. Facility Code
This identifies your organization in the system. Your new cards must match this code.
2. Card Format
This defines how the data is structured. Common formats include 26-bit, 37-bit, and others.
3. Card Number Range
You want your new cards to continue your existing numbering sequence to avoid duplicates.
If you match these three things, your cards will work seamlessly.
---Compatible vs Branded Prox Cards
Many systems use well-known brands, but that does not mean you have to keep paying brand-name prices.
Compatible proximity cards are designed to match the same frequency and format, meaning they work with your existing readers.
Benefits include:
- Lower cost
- Same functionality
- Fast replacement ordering
This is especially important for schools, property managers, and large facilities ordering in bulk.
---Standard vs Clamshell Cards
You will typically see two main styles:
- Standard PVC cards - thin, badge-like cards used with holders
- Clamshell cards - thicker, more durable cards with a built-in slot hole
Your choice depends on how the card will be used and whether you need durability or flexibility.
---Can You Print or Customize Prox Cards?
Yes. Many proximity cards can be printed with logos, photos, or text for identification purposes.
If you are using badge holders or lanyards, you can pair your cards with:
---How to Order the Right Proximity Cards
- Confirm your facility code
- Confirm your card format
- Identify your current card number range
- Order compatible cards that match your system
If you are unsure, many customers simply send a photo of their existing card and get help matching it.
---Final Thoughts
Choosing the right proximity card is not complicated once you know what to look for.
Most buyers are simply replacing existing cards, and the key is matching your system correctly. With the right information, you can save money by using compatible cards while keeping everything running smoothly.
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