Can these fobs be cloned like old prox fobs?
No — they are 13.56 MHz MIFARE DESFire EV3 credentials with encryption and mutual authentication. What works on 125 kHz prox fobs fails here.
★ Brivo
Brivo Smart Key Fobs EV3, 25-Pack (B-BUC3)
Model B-BUC3 SF25 · SKU B-BUC3-56-SF25
Encrypted EV3 key fobs on 13.56 MHz for Brivo readers, 25 to a pack. Two formats — B-BUC3-56-SF25 (56-bit) and B-BUC3-37-SF25 (37-bit) — at the same $234 MSRP. Each fob is a unique credential in the account.
We install and repair access control systems across Chicago, the North Shore and the northwest suburbs — ask about the B-BUC3 SF25 for your building or business.
- Frequency 13.56 MHz MIFARE DESFire EV3, 8K
- Formats 56-bit or 37-bit
- Pack size 25 fobs
- Works with Brivo B-BS / B-BSP / B-S readers
$234 MSRP · project pricing on quote
Key details
| Brand | Brivo |
|---|---|
| Catalog category | Access Control Systems |
| Typical use | Security projects in Chicago North Shore – homes, small business and multifamily buildings, depending on how the system is designed. |
| How we use it | As part of complete systems (cameras, access control, intercoms, networking) rather than standalone online sales. |
Product overview and installer notes
The physical credential for everyone who prefers a keyring to a phone, and for cleaners, dog walkers and contractors who need access without an app tied to anyone’s account. These are 13.56 MHz MIFARE DESFire EV3 fobs with 8K of storage: encrypted, mutually authenticated, and not duplicable the way old 125 kHz fobs are. Works with the Brivo B-BS, B-BSP and B-S reader series.
Specs, firmware notes and availability change over time — confirm against the manufacturer’s current documentation before ordering.
Why EV3 fobs cannot be casually copied
The clamshell prox fobs most buildings handed out in the 2010s run at 125 kHz and transmit their number in plain air — a kiosk at the hardware store clones one while you wait. These EV3 fobs work on 13.56 MHz with encryption and mutual authentication: the fob and the reader verify each other cryptographically before the credential is accepted.
Every fob carries its own unique identifier and is enrolled in the Brivo account exactly like any other credential — scoped to specific doors and zones, disabled in a couple of clicks when it goes missing or a tenant moves out, and stamped into the event log at every use.
56-bit or 37-bit: which pack to order
The two part numbers differ only in credential format: B-BUC3-56-SF25 uses the 56-bit numbering scheme, B-BUC3-37-SF25 the 37-bit one. Which one a building needs depends on how its Brivo account numbering was configured — usually a legacy of whatever system came before. Both cost $234 MSRP per 25-pack, both read on the B-BSSF, B-BSMF and the rest of the smart reader line, and we confirm the right format during system design so the fobs work on delivery day.
Common questions about the B-BUC3 SF25
Which format do I need, 56-bit or 37-bit?
It depends on the credential numbering configured in your Brivo account. We check this during design; ordering the wrong format is the classic self-install mistake.
How much does one fob cost?
The pack of 25 lists at $234 MSRP, which works out to $9.36 per fob. Both formats are priced the same.
Which readers accept them?
The Brivo B-BS, B-BSP and B-S smart reader series — including every reader we stock: B-BSSF, B-BSMF, B-BSKF, B-BSPSF, B-BSPMF and B-BSPKF.
Service, upgrade and maintenance
If you already have Brivo hardware on site and the system is unstable, we can audit it, fix urgent issues and plan upgrades step by step instead of forcing a complete replacement. This includes systems originally installed by other vendors.
We offer free estimates for projects in our service area. New service clients also receive a 50% discount on the first service visit for troubleshooting and diagnostics, including systems we did not install.
To move forward, go to the Contact page and mention model B-BUC3 SF25 in your message. You can also attach photos of your existing equipment, panels or racks to speed up the design and service process.
