125kHz TK4100 RFID Key Fob

Product Introduction:

 

This 125kHz TK4100 ABS RFID key fob is designed for access control, attendance, hotel door locks, membership identification, parking entry, and other short-range proximity systems. Each key tag carries a fixed ID number and can be enrolled into compatible access control software for daily door entry and user identification.

 

For projects that need a stable low-frequency credential, this read-only 125kHz proximity key tag is a practical choice for legacy readers and cost-sensitive replacement orders. It does not require a battery, and users only need to place the keyfob near the reader to complete identification.

If your project requires the same chip family in another shape, you can also compare our 125kHz EM4100 TK4100 key fobs for access control before confirming the final model.

 

Product Parameters:

 

Product name	125kHz TK4100 ABS RFID Key Fob Tag
Size	37*30mm
Material	ABS
Chip	TK4100
Frequency	125Khz
Compatible format	EM4100 / TK4100 compatible ID format
Working life	100,000 times
Working temperature	-20℃~70℃
Weight	0.005KG
Reading distance	2~5cm
Memory	64 bits
Function	Read-only fixed ID
Typical use	Door access, attendance, hotel lock, membership, parking entry
Customization	Logo printing, UID printing, laser number, color, packaging

 

Best For:

• Door access control systems using 125kHz LF proximity readers
• Apartment, office, school, gym, factory, and hotel access projects
• Replacement keyfob orders for existing TK4100 or EM4100-compatible systems
• Bulk distribution where UID printing, serial numbering, or logo customization is required

 

Key Features:

TK4100 chip for 125kHz access control: suitable for systems that read fixed low-frequency ID credentials.

Durable ABS shell: lightweight, easy to carry, and suitable for daily keyring use.

Short-range tap access: typical reading distance is 2–5cm, depending on reader power, installation environment, and antenna tuning.

Low-cost bulk replacement: suitable for property managers, system integrators, distributors, and maintenance projects.

Custom branding available: logo printing, laser numbering, UID printing, color selection, and custom packaging can be arranged for volume orders.

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Compatibility Notes Before Ordering:

 

This 125kHz RFID key tag should be selected by reader compatibility first, not by shape or color only. Please confirm whether your reader supports TK4100, EM4100, EM4200, or other 125kHz ID formats before mass production. If the project also includes door hardware, you may review our RFID access control reader and controller options to match credentials with the correct reader.

 

TK4100 keyfobs are normally read-only credentials. They are suitable for systems that only need a fixed ID number, but they are not designed for rewriting, encrypted authentication, or changing card formats after production. For migration projects, please send your existing card sample, reader model, or required data format so we can help confirm whether TK4100, T5577, MIFARE, or dual-frequency keyfobs are more suitable.

 

Advantages of 125kHz TK4100 RFID Tags in Access Control Management

 

1. Easy Daily Use: Compared with metal keys, passwords, or manual registration, users can present the RFID keyfob near the reader and the access controller will verify the ID automatically.
    
2. Good Legacy System Fit: Many older door entry systems still use 125kHz proximity technology, making this custom 125kHz access control key fob useful for replacement and maintenance orders.
    
3. Customization for Projects: The shell can be supplied in standard colors, and project orders can include logo printing, laser UID numbers, inkjet numbering, barcode labels, or sorted packaging.
    
4. Compact and Portable: The keyring design is convenient for employees, residents, hotel guests, members, and temporary visitors.
    
5. Cost-Effective for Bulk Use: For large facilities, schools, apartments, gyms, and distributors, low-frequency TK4100 credentials offer a practical balance between price, availability, and simple access identification.

 

Package:

• 100pcs/bag
• 2500pcs/ctn
• Carton size:38*20*28cm
• GW:12KG
   

 

Customization & Ordering Options:

 

For custom printed RFID key fobs with UID numbering, please provide your artwork file, preferred color, numbering rule, and whether the UID should be printed in decimal, hexadecimal, or another system format. We can also help sort numbers by bag or carton to make on-site enrollment easier.

 

1. Logo printing: silk screen, pad printing, or other suitable process depending on artwork
2. Numbering: UID number, serial number, barcode, QR code, or customer-defined code
3. Color: standard blue or other available shell colors according to order quantity
4. Encoding check: reader model, sample card, or required data format can be confirmed before production
5. Bulk packaging: standard bag/carton packing or customized label packing for distributors

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If your users prefer card-style credentials instead of keyrings, you can compare this product with our 125kHz clamshell access cards for the same type of low-frequency door entry application.

 

Application Scenarios of 125kHz RFID Key Tags:

 

1. Office building: RFID keyfobs can be used to grant access to employee workspaces, elevators, meeting rooms, and parking garages.
2. Industrial plants: RFID keyfobs can help control access to workshops, warehouses, machine rooms, hazardous zones, and restricted production areas.
3. Hotels and apartments: Property managers can issue compact keyring credentials for rooms, gates, elevators, and shared facilities.
4. Hospitals: RFID keyfobs can be used for staff access to medicine storage, office zones, and controlled departments where simple credential management is required.
5. Universities and gyms: These tags are suitable for dormitory entry, membership check-in, locker rooms, classrooms, and attendance management.

 

Buyer Checklist Before Mass Production:

• Confirm the reader frequency: 125kHz LF, 13.56MHz HF, or dual-frequency.
• Confirm chip compatibility: TK4100, EM4100, EM4200, T5577, MIFARE, or other required chip.
• Confirm whether your system needs a read-only ID or a writable credential.
• Confirm number format before printing: decimal, hexadecimal, Wiegand-related format, or customer database format.
• Test samples on the actual reader before bulk production, especially for replacement or migration projects.

For a deeper explanation of how the credential, reader, controller, and lock work together, see our guide on how RFID keyfobs work for access control.

 

 

Technical Reference:

For neutral background on low-frequency RFID systems, you may refer to the ISO/IEC 18000-2 RFID air interface standard below 135 kHz and the RFID Journal overview of low-frequency RFID systems.

 

Request a Quote:

Send us your reader model, required chip, quantity, logo file, numbering format, and delivery country. We can help confirm compatibility, prepare samples, and quote the most suitable 125kHz RFID key fob solution for your access control project.

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