RFID Keyfob Access Tag for 125kHz Systems
125kHz RFID Keychain Tag for Access Control
An RFID keyfob access tag is a compact keychain credential used with compatible RFID readers for close-range access control and user identification.
This product is a 125khz RFID keychain tag with an ABS housing, suitable for access systems that require a portable fob instead of a card.
The correct fob depends on the installed reader and required chip format.
Key Features
- Compact RFID Keychain Format
The fob can be carried on a keyring, lanyard, or user badge set for daily access use. - Rewritable Chip Option
T5577 chip options can support programming or format configuration when used with compatible 125 kHz writer equipment. - Sealed ABS Housing
The ABS shell helps protect the internal RFID chip during daily handling. IP67-rated options are available when water and dust protection are required. - Custom Visible Identification
The fob can include logo printing, laser numbering, barcode, QR code, color selection, or user-visible ID marking.
Technical Specifications
| Feature | Specification |
| Product Type | RFID keyfob access tag / 125 kHz RFID keychain tag |
| Form Factor | Keychain-style RFID tag |
| RFID Type | Passive LF RFID |
| Frequency | 125 kHz |
| Main Rewritable Chip | T5577 / ATA5577-type chip |
| Read-Only Chip Options | TK4100, EM4200, or EM4100-compatible options by project requirement |
| Reading Method | Close-range scan by compatible 125 kHz RFID reader |
| Writing Method | Requires compatible 125 kHz RFID writer and correct data format |
| Read Range | Up to 10 cm, depending on reader, chip, antenna, and environment |
| Material | ABS housing; PVC or epoxy options by project requirement |
| Size | Approx. 40 × 32 × 4 mm, or custom size by mold availability |
| Color Options | Blue, black, red, yellow, white, or custom color |
| Printing Options | Logo, serial number, laser ID, barcode, QR code, or custom text |
| Encoding Options | UID/code matching, ID programming, format configuration, or database association |
| Operating Temperature | -25°C to +70°C |
| Protection Option | IP67-rated sealed housing, subject to selected structure |
| MOQ | 500 pcs |
A 125 kHz RFID keychain tag is not automatically compatible with NFC, MIFARE, 13.56 MHz HF, or UHF RFID systems.
Typical Applications
- Building and Apartment Access
Used for office doors, residential buildings, staff entrances, and shared facility access. - Gym and Club Membership
Used by gyms, clubs, and leisure facilities to identify members at reception or entry gates. - Hotel and Resort Access
Used for guest access, staff areas, lockers, or facility permissions when the system supports 125 kHz RFID. - Time Attendance Systems
Used by employees, contractors, or service teams for close-range attendance verification. - Parking and Gate Entry
Used as a portable access credential for vehicle gates, residential parking, and controlled entry points.
Which RFID Keychain Chip Fits Your System?
| Chip Option | Data Type | Suitable Use | Compatibility Note |
| T5577 | Rewritable or configurable | Systems requiring programmed or changeable 125 kHz credentials | Requires compatible reader, writer, and data format |
| TK4100 | Read-only ID | Basic access control and fixed-ID replacement | ID cannot normally be rewritten |
| EM4200 | Read-only ID | LF identification systems using EM-compatible formats | Reader output format should match software |
| EM4100-compatible | Read-only ID | Legacy 125 kHz access systems | Confirm format before bulk production |
Choose T5577 when the project needs a rewritable RFID keychain.
Choose TK4100, EM4200, or EM4100-compatible options when the access system only requires a fixed read-only ID.
125kHz RFID Keychain Tag vs 13.56MHz Key Fob
| Comparison Point | 125kHz RFID Keychain Tag | 13.56MHz RFID/NFC Key Fob |
| Frequency | 125 kHz LF | 13.56 MHz HF/NFC |
| Common Chips | T5577, TK4100, EM4200 | MIFARE, NTAG, DESFire, or other HF options |
| Smartphone NFC Use | Not supported | Possible with compatible NFC chips |
| Reader Requirement | 125 kHz LF reader | 13.56 MHz HF/NFC reader |
| Typical Selection Reason | Existing LF access or attendance system | NFC interaction, MIFARE system, or HF access platform |
Choose the key fob according to the reader already installed in the access system.
The same external keychain shape can contain different RFID chips, so frequency and chip compatibility should be confirmed before bulk production.
Daily Access Workflow with RFID Keyfobs
A hotel, gym, apartment, parking, or locker system can issue RFID keyfobs to users instead of printed cards or manual identifiers.
Each fob ID is linked to a guest, member, resident, staff account, or access permission in the management system.
At the door, gate, reception desk, or locker point, the user presents the key fob to a compatible 125 kHz reader.
The software checks the fob ID and returns the access result according to the system record.
This workflow is suitable when the project needs reusable RFID keyfobs for daily access without relying on paper tickets, magnetic stripe cards, or manual identity checks.
Need RFID Keyfobs for an Existing Access System?
Send one working fob, the reader model, or the required data format before production.
The project can then be checked for chip compatibility, programming requirements, housing selection, printing method, and whether a rewritable T5577 or read-only 125 kHz option is more suitable.
Sample testing is recommended when replacing existing hotel, gym, apartment, parking, locker, or attendance credentials.
Frequently Asked Question
What is RFID keyfob access?
RFID keyfob access uses a keychain-style RFID credential to identify a user at a compatible reader. The reader sends the fob ID to the access system for verification.
Is a 125khz RFID keychain tag rewritable?
It is rewritable only when a writable chip such as T5577 is selected. TK4100 and EM4200 options are normally used as read-only ID credentials.
Can this RFID keychain work with my existing access reader?
It is rewritable only when a writable chip such as T5577 is selected. TK4100 and EM4200 options are normally used as read-only ID credentials.
Is this RFID key fob waterproof?
IP67-rated sealed housing options are available. The exact waterproof requirement should be confirmed according to the selected housing, usage environment, and test conditions.
What affects RFID key fob reading performance?
Reading performance depends on chip type, reader model, antenna design, fob position, scan distance, surrounding materials, and software response time.
Get Your Custom RFID Tags
As a leading custom RFID tag manufacturer, we craft solutions based on the unique needs of your operation. We offer a wide range of customization options, including material, size, frequency, encoding, and read distance, ensuring each RFID Tag is perfectly customized to your requirements. No matter what application you use RFID tags for, we can provide rugged, reliable RFID tags that meet the highest quality and durability standards. Here are the main ways we customize RFID tags to fit your needs.
Material Selection
Material is key for customizing RFID tags. Plastic works in harsh conditions, while softer materials suit delicate spaces. Different materials also affect signal performance. Pick what fits your use case to ensure your tags last and work reliably.
Customized Size
Size shapes usability. Small tags fit tight spaces or tiny items, while larger tags are easily read. In crowded areas, sleek tags prevent clashes. Align shape and dimension with your goods for visibility, convenience, and performance.
Frequency Requirements
Choose LF, HF, or UHF based on read range, speed, and interference. LF and HF resist metals and liquids but have shorter ranges. UHF offers an extended range yet may face signal blocks. Match frequency to your environment for reliable performance.
Reading Distance
Define the distance at which you have to read the tag. Short distances work for retail checkouts, while warehouses may need meters of coverage. Antenna design, reader settings, and power outputs affect range.Adjust these factors to capture data accurately at the distance you need.
Encode
Plan how data is stored on each tag. Some only hold an ID, while others contain detailed info. Decide if you need a simple EPC or added user memory. Ensure your chosen format works with existing software. Proper encoding streamlines processes and slashes errors.
Application Environment
Consider real-world conditions. Temperature swings, humidity, and chemicals can degrade tags. For outdoor use, opt for UV-resistant casings. In healthcare or food settings, ensure compliance with safety rules. Matching your tags to the environment maximizes their lifespan.
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Customize any RFID tags from our factory to meet your requirements.
