Product Description
125 kHz EM4100/EM4102-type proximity fob for standalone and networked access control installs. Pre-programmed with a unique factory ID, read-only, ready to enrol against any compatible controller on site.
Key specs
- Frequency: 125 kHz
- Chip compatibility: EM4100 / EM4102 protocol readers
- Read range: typically 2–10 cm, dependent on reader sensitivity and mounting
- ID: unique, factory pre-programmed — not user-rewritable
- Housing: ABS, water-resistant
- Format: keychain fob, fits standard split ring / lanyard clip
Deployment notes
Where a job spec calls for a low-cost 125 kHz credential to top up an existing EM4100/EM4102 estate — office door entry, residential block access, parking barriers, or standalone keypad controllers — this fob enrols the same way as any other 125 kHz tag: present to reader, capture ID, assign in the access control database.
Because the ID is factory-set and fixed, there's no cloning or field-writing step to plan for — enrolment is read-and-assign only. Confirm the installed reader/controller is 125 kHz EM4100/EM4102 compatible before ordering in bulk; this fob is not built for 13.56 MHz (MIFARE/DESFire) systems.
Also listed under part number GR-ACM-KEYFOB-125KHZ-LN for cross-reference against older POs or catalogue entries.
Specifications
- Brand
- ACM
Technical Specifications
Frequently Asked Questions
What chip standard does this fob use?
It operates at 125 kHz and is compatible with EM4100/EM4102-type readers, which covers a wide range of standalone and networked door entry and access control systems.
Can the ID on the fob be changed or rewritten?
No. Each fob carries a unique factory pre-programmed ID that is fixed at manufacture — enrolment is a read-and-assign process on your controller, not a write/clone process.
What read range should I plan for?
Typically 2–10 cm, though actual range depends on the specific reader's sensitivity and how it's mounted.
Will this work with 13.56 MHz MIFARE or DESFire readers?
No. This fob is a 125 kHz EM4100/EM4102 credential and is not designed for 13.56 MHz systems; check your reader's supported frequency before ordering.
Is there an alternative part number for this fob?
Yes, it's also listed as GR-ACM-KEYFOB-125KHZ-LN, useful when cross-referencing older purchase orders or catalogue records.
