100pcs 125KHz EM4100 RFID Keyfob Tags – Access Control & Attendance
100pcs 125KHz EM4100 RFID Keyfob Tags – Access Control & Attendance
100-Pack 125KHz EM4100 RFID Keyfob Tags for Access Control, Time Attendance & Intercom Systems
Upgrade your security setup with this bulk pack of 100 x 125KHz EM4100 Read-Only RFID Keyfob Tags. Compatible with the vast majority of standard 125KHz access control readers, time attendance terminals, and intercom systems, these rugged keyfobs deliver fast, reliable scanning every time. Whether you're managing a small office, apartment building, gym, or warehouse, this cost-effective bulk pack ensures you always have spares on hand.
Made in Mainland China.
Key Features
- Chip: TK4100 / EM4100 — industry-standard read-only chip widely supported by 125KHz readers
- Frequency: 125KHz — compatible with most legacy and modern RFID access control systems
- Working Type: Read-Only — secure, tamper-proof unique ID for each tag
- Reading Distance: 1–5 cm for reliable close-range scanning
- Reading Speed: 1–2 ms for near-instant card recognition
- Operating Temperature: -20°C to +85°C — suitable for indoor and outdoor environments
- Durability: Rated for over 100,000 read cycles for long-lasting performance
- Construction: Anti-corrosion, high-temperature-resistant shell with RF chip sealed in epoxy resin and ultrasonically welded for maximum protection
- CE Certified — meets relevant European conformity standards
Ideal Use Cases
- Door access control systems (offices, apartments, warehouses)
- Employee time and attendance tracking
- Intercom and gate entry systems
- Gym, club, or membership access management
- Parking and vehicle access control
Package Contents
- 100 x EM4100 / TK4100 Read-Only 125KHz RFID Keyfob Tags
Technical Specifications
| Chip | TK4100 / EM4100 |
| Frequency | 125KHz |
| 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 |
| Origin | Mainland China |
| Quantity | 100 pcs per pack |
Why Choose These RFID Keyfobs?
These keyfobs use the globally trusted EM4100 protocol, ensuring broad compatibility with hundreds of reader brands. The epoxy-sealed, ultrasonically welded housing keeps the internal chip protected from dust, moisture, and everyday wear — making them ideal for high-traffic environments. Buying in bulk means you're ready for new hires, replacements, or system expansions without delay.
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 keyfobs compatible with my existing access control reader?
A: These keyfobs use the widely adopted EM4100 / TK4100 chip at 125KHz, which is compatible with the vast majority of standard 125KHz RFID access control readers, time attendance systems, and intercom units. Always verify that your reader supports 125KHz EM/TK4100 protocol before purchasing.
Q: Can I write new data to these RFID keyfob tags?
A: No. These are read-only RFID tags, meaning each keyfob carries a permanently encoded, unique ID that cannot be overwritten. This design enhances security by preventing duplication or tampering.
Q: How durable are these keyfobs for daily use?
A: Each keyfob is rated for over 100,000 read cycles and is constructed with an anti-corrosion, high-temperature-resistant shell. The RF chip is sealed in epoxy resin and ultrasonically welded, making it highly resistant to dust, moisture, and physical wear in busy environments.
Q: What operating temperatures can these keyfobs handle?
A: These RFID keyfobs operate reliably in temperatures ranging from -20°C to +85°C, making them suitable for both indoor environments and moderately exposed outdoor access points.