RFID 125KHz Proximity Keyfob Tags – TK4100 EM4100, 8 Colors

RFID 125KHz Proximity Keyfob Tags – TK4100 / EM4100 Compatible

Upgrade your access control or time-attendance system with these reliable 125KHz RFID Proximity Keyfob Tags. Compatible with the widely used TK4100 and EM4100 chip standards, these compact keyfobs are built for everyday convenience — whether you're managing office entry, gym access, or attendance tracking. Choose from 8 color options to easily organize or distinguish users at a glance.

Key Features

• Chip Standard: TK4100 / EM4100 (125KHz read-only)
• Material: Durable ABS plastic housing
• Dimensions: Approx. 43.7 × 30.5 × 5.3 mm — slim and pocket-friendly
• Operating Temperature: -40°C to 85°C — suitable for indoor and outdoor environments
• Waterproof: Splash- and rain-resistant for reliable daily use
• Includes: Built-in key ring loop for easy attachment to keys or lanyards
• Colors Available: 8 color options for simple user differentiation

Compatibility & Use Cases

These RFID keyfobs are designed to work seamlessly with standard 125KHz access control readers and time-attendance terminals that support TK4100 or EM4100 protocols. Ideal for:

• Office and building access control
• Gym, club, and facility entry systems
• Employee time-attendance tracking
• School or residential gate systems

Durable & Practical Design

Housed in sturdy ABS plastic, each keyfob is built to withstand the wear and tear of daily handling. The wide operating temperature range makes them dependable in warehouses, outdoor entry points, and other demanding environments. The integrated key ring means your team can carry them effortlessly alongside their regular keys.

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Frequently Asked Questions

Q: What chip standard do these RFID keyfob tags use, and are they compatible with my reader?

A: These keyfob tags use the TK4100 / EM4100 chip standard operating at 125KHz. They are compatible with the vast majority of standard 125KHz access control readers and time-attendance terminals that support read-only EM/TK format — one of the most common formats worldwide.

Q: Are these RFID keyfobs waterproof?

A: Yes. The keyfobs feature a splash- and rain-resistant ABS plastic casing, making them suitable for everyday outdoor use such as gate entry systems or car parks. They operate reliably across a temperature range of -40°C to 85°C.

Q: What size are the keyfobs and how are they carried?

A: Each keyfob measures approximately 43.7 × 30.5 × 5.3 mm — compact enough to sit comfortably on a keychain. Every tag includes a built-in key ring loop so it can be attached to keys, lanyards, or badge holders with ease.

Q: Can I use different colors to manage multiple users or access levels?

A: Absolutely. These RFID proximity keyfob tags are available in 8 distinct colors, making it easy to color-code users, departments, or access zones for quick visual identification at a glance.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.