Descrizione
Access control lives on low frequency cards that nobody thinks about until one fails. The fob on the keyring stops reading, the property manager needs twenty spares before Friday, and the original supplier wants six weeks and a minimum order. A box of blank rewritable fobs in the van turns that problem into a ten minute job.
These fobs run T5577 and EM4305 chips, both of which are rewritable at 125kHz. That combination covers most legacy proximity systems: hotel door locks, gym turnstiles, apartment building readers, time clocks and the older parking barriers still running EM4100 compatible protocols. A standard 125kHz writer clones an existing credential onto a blank in seconds.
The mix of chip types in one pack matters, because a T5577 can emulate an EM4100 but not every reader accepts it, and an EM4305 sometimes reads where a T5577 will not. Carrying both means the job finishes on the first visit instead of the second. Each fob is ABS cased with a moulded keyring loop that survives being dropped on concrete.
Fifty blanks is the working quantity for anyone doing installations. It covers a small apartment block, a gym membership batch, or a season of callouts, and it costs less per unit than buying replacements one at a time from a locksmith. Note that cloning credentials you do not own or administer is restricted in many jurisdictions, so keep the use to systems you control.
A blank fob is a fifteen pence answer to a forty pound callout.
Key Features
- ✦Fifty rewritable fobs per pack in mixed T5577 and EM4305 chips
- ✦125kHz low frequency operation compatible with legacy readers
- ✦Readable and rewritable with a standard 125kHz writer
- ✦EM4100 emulation support for older access systems
- ✦ABS housing with a moulded keyring loop
- ✦Bulk quantity sized for installers and property managers
Technical Specifications
- Model Number: EM4305 Tags
- Certification: CE
- Operating Frequency: 125kHz low frequency
- Chip Types: T5577 and EM4305, mixed per pack
- Pack Quantity: 50 fobs
- Housing: ABS plastic with keyring loop
Where It Earns Its Place
Property managers keep a box for tenant turnover, replacing lost fobs the same day instead of waiting on a supplier. Hotel maintenance teams use the blanks for room locks that run 125kHz credentials. Gym and studio operators batch program membership fobs at the front desk. Locksmiths and access control installers carry a mixed pack so a site visit covers whichever chip the reader demands.
Frequently Asked Questions
Q: What writer do I need to program these?
A: Any 125kHz writer that supports T5577 and EM4305 chips, including the common handheld copiers and USB writers used by locksmiths. Read the source credential first, then write the same data to the blank.
Q: Can these copy a hotel room key?
A: Technically the chip can hold the data. Legally, copying a credential you do not administer is restricted in most countries. Use these for systems you own or are contracted to manage.
Q: Will they work with a 13.56MHz system?
A: No. These are 125kHz low frequency fobs. High frequency 13.56MHz systems such as Mifare need a different chip family and will not read these fobs.
Q: What is the difference between T5577 and EM4305?
A: Both are rewritable 125kHz chips with slightly different read behaviour. T5577 clones EM4100 credentials readily. EM4305 sometimes reads on readers that reject a T5577, which is why a mixed pack saves repeat visits.
Q: How many times can a fob be rewritten?
A: In practice thousands of write cycles, far beyond the life of the plastic. The housing fails before the chip does.
Q: Are the fobs waterproof?
A: The ABS case resists splashes and rain. They are not rated for immersion, so avoid leaving them in a pocket through a wash cycle.
Q: How do I test a fob before handing it out?
A: Write the credential, then read it back on the same writer and confirm the ID matches the source. Finish with a live read on the target reader, since some systems check a sector the writer does not display.
Q: Do you supply the writer as well?
A: The set covers blank fobs only. Any 125kHz writer on the market handles these chips, and we can quote a reader and writer bundle on request for installation teams.
The EastSupplier Promise
Every unit ships from a vetted production partner, is inspected against the specification sheet above, and travels with tracking from the factory floor to your door. If a parcel arrives damaged or out of spec, our team replaces or refunds it without a debate. Questions before you order go to a human who has handled the product, not to a script.
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