100pcs 125KHz EM4100 RFID Tags – Access Control Keyfobs
100pcs 125KHz EM4100 RFID Tags – Access Control Keyfobs
100-Pack 125KHz EM4100 RFID ID Tags — Reliable Access Control & Time Attendance
Upgrade your building security, time-attendance system, or intercom setup with this bulk pack of 100 x 125KHz EM4100 / TK4100 RFID keyfob tags. Each tag is read-only, pre-programmed with a unique ID, and built to perform consistently scan after scan in demanding environments.
Why Choose These RFID Tags?
- Universal 125KHz Frequency — Compatible with the vast majority of standard RFID readers, access control panels, time-attendance terminals, and intercom systems using EM4100 or TK4100 protocol.
- Ultra-Fast Reading — 1–2 ms read speed means virtually instant, seamless entry — no delays at the door.
- Reliable Short-Range Detection — Reads cleanly at 1–5 cm, reducing false triggers while keeping access smooth and convenient.
- Exceptional Durability — Rated for over 100,000 read cycles. The RF chip is sealed in high-quality epoxy resin and welded ultrasonically inside a corrosion-resistant, high-temperature-resistant shell.
- Wide Operating Temperature — Performs reliably from -20°C to 85°C, suitable for both indoor and outdoor installations.
- Read-Only Security — Factory-encoded unique ID cannot be overwritten, preventing accidental or unauthorized cloning.
- Bulk Value — 100 tags per order — ideal for offices, apartment complexes, schools, gyms, warehouses, and any facility needing a full credential rollout.
- CE Certified — Meets CE compliance standards for quality and safety.
Technical Specifications
| Chip | TK4100 / EM4100 |
| Frequency | 125 KHz |
| Working Type | Read-Only |
| Reading Distance | 1–5 cm |
| Reading Speed | 1–2 ms |
| Operating Temperature | -20°C to 85°C |
| Endurance | >100,000 read cycles |
| Certification | CE |
| Quantity | 100 pcs per pack |
| Country of Origin | Made in Mainland China |
What's in the Box?
- 100 × 125KHz EM4100 / TK4100 Read-Only RFID Keyfob Tags
Common Applications
- Door access control systems
- Employee or visitor time-attendance tracking
- Apartment and building intercom entry
- Gym, school, or library membership cards
- Warehouse and asset management
- Parking lot access
For more information on RFID technology standards and security best practices, visit the National Institute of Standards and Technology (NIST) Cybersecurity resources.
Frequently Asked Questions
Q: Are these 125KHz EM4100 RFID tags compatible with my existing access control reader?
A: Yes — these tags operate at the industry-standard 125KHz frequency using the EM4100 / TK4100 protocol, which is compatible with the vast majority of commercially available RFID access control readers, time-attendance systems, and intercoms that support EM4100 or TK4100 credentials. Always confirm your reader supports 125KHz EM4100 before ordering.
Q: Can these RFID keyfob tags be reprogrammed or cloned?
A: No. These are factory-encoded, read-only tags. The unique ID stored on each chip cannot be overwritten, which provides an added layer of security and prevents unauthorized duplication.
Q: How durable are these RFID tags for outdoor or harsh environments?
A: Very durable. Each tag's RF chip is sealed in epoxy resin and ultrasonically welded inside a corrosion-resistant, high-temperature-resistant shell. They operate reliably in temperatures from -20°C to 85°C and are rated for over 100,000 read cycles, making them suitable for both indoor and outdoor applications.
Q: How many tags come in this pack and what is the reading range?
A: This listing includes 100 RFID keyfob tags. The effective reading distance is 1–5 cm, which is standard for 125KHz proximity access control systems and ensures controlled, deliberate scans at entry points.