10-Pack 125kHz RFID TK4100 Keyfob – Access Control Key Tags
10-Pack 125kHz RFID TK4100 Keyfob – Access Control Key Tags
Keep your door access system running smoothly with this 10-pack of 125kHz RFID TK4100 Proximity Keyfobs. Each compact, durable token comes pre-programmed with a unique laser-printed ID, making it a plug-and-play addition to any compatible access control system — no configuration headaches required.
⚠️ Read-Only Tags: These keyfobs use the TK4100/EM4100 chip and are read-only — they cannot be overwritten or re-encoded. If you need a rewritable/programmable option, look for T5577 keyfobs in our store.
Key Features
- Chip: TK4100 (EM4100 available — just leave a note at checkout)
- Frequency: 125 kHz
- Material: Durable ABS plastic & metal construction
- Dimensions: Approx. 43.7 × 30.5 × 5.3 mm — slim and keychain-ready
- Operating Temperature: -40°C to 85°C — wide-range, weather-resistant performance
- Water-Resistant: Built to handle everyday outdoor exposure
- Unique ID: Each token is pre-programmed with a unique ID, laser-printed for easy identification
- Key Ring Included: Each fob ships with a keyring attached — ready to use right out of the box
- Quantity: 10 pieces per lot
Compatible Applications
These RFID keyfobs are versatile and work across a wide range of systems, including:
- Building and office door access control
- Parking management systems
- Employee attendance and time-tracking systems
- Ticketing and event management
- Public transportation fare systems
- ID identification and product labeling
Color Selection
These keyfobs are available in multiple colors. To request a specific color (e.g., all red), simply leave a note at checkout such as "Please send red." For a mixed order, specify the split (e.g., "5 red, 5 yellow"). If no color preference is noted, colors will be selected at random.
Specifications at a Glance
| Chip Type | TK4100 / EM4100 |
| Frequency | 125 kHz |
| Read/Write | Read-Only |
| Material | ABS & Metal |
| Dimensions | 43.7 × 30.5 × 5.3 mm |
| Temp. Range | -40°C to 85°C |
| Water Resistance | Yes |
| Quantity | 10 pcs/lot |
| Key Ring | Included |
For more information on RFID technology and security standards, visit the National Institute of Standards and Technology (NIST) – Cybersecurity.
Frequently Asked Questions
Q: Are these 125kHz RFID keyfobs compatible with my existing access control reader?
A: These TK4100/EM4100 keyfobs operate at 125 kHz and are compatible with most standard 125 kHz RFID access control readers. Check your reader's specifications to confirm it supports the 125 kHz frequency and TK4100 or EM4100 chip standard before purchasing.
Q: Can I reprogram or rewrite these RFID keyfobs?
A: No — these are read-only tokens. Each keyfob comes pre-programmed with a fixed, unique ID that cannot be changed or overwritten. If you need a rewritable option, search for T5577 keyfobs, which support re-encoding.
Q: How do I request a specific color for my order?
A: Simply leave a note at checkout specifying your preferred color or color mix (e.g., "all blue" or "5 red, 5 black"). If no note is left, colors will be assigned randomly from the available options.
Q: Are these keyfobs waterproof and suitable for outdoor use?
A: Yes — these RFID keyfobs are water-resistant and rated to operate in temperatures from -40°C to 85°C, making them well-suited for both indoor and outdoor access control installations.