100pcs 125KHz RFID Key Fob Tags EM4100 Access Control Keychains
100pcs 125KHz RFID Key Fob Tags EM4100 Access Control Keychains
100-Pack 125KHz RFID Key Fob Tags — Reliable Access Control & Time Attendance
Keep your access control or time attendance system running smoothly with this bulk pack of 100 x 125KHz RFID key fob tags. Compatible with all standard EM4100/TK4100 readers, these durable keyfobs are ready to use straight out of the box — no programming required. Available in 4 vibrant colours, they make it easy to colour-code staff, departments, or access zones.
Key Features
- Chip: TK4100 / EM4100 — industry-standard read-only RFID chip
- Frequency: 125KHz — universally compatible with most access control readers
- Working Type: Read-only — secure, tamper-resistant unique ID
- Reading Distance: 1–5 cm for reliable short-range scanning
- Reading Speed: 1–2 ms — near-instant response every time
- Operating Temperature: -20°C to 85°C — performs in demanding environments
- Endurance: >100,000 read cycles — built to last for years of daily use
- Construction: Anti-corrosion, high-temperature resistant shell; RF chip sealed with epoxy resin and ultrasonically welded for a robust, waterproof build
- CE Certified for quality and safety compliance
- 4 Colours included — perfect for colour-coded access level management
What's in the Box
- 100 × 125KHz EM4100/TK4100 Read-Only RFID Key Fob Tags (assorted colours)
Ideal Use Cases
- Office & building access control systems
- Employee time and attendance tracking
- School, gym, or facility entry management
- Parking lot and gate access
- Replacement or expansion of existing 125KHz RFID systems
Made in Mainland China.
For guidance on best practices for physical access control security, visit the NIST Cybersecurity resource page.
Frequently Asked Questions
Q: Are these 125KHz RFID key fobs compatible with my existing access control reader?
A: Yes — these keyfobs use the EM4100/TK4100 chip operating at 125KHz, the most widely adopted standard for proximity access control readers. They are compatible with the vast majority of 125KHz EM readers available on the market. Always verify your reader supports 125KHz EM4100 format before purchasing.
Q: Can I write or reprogram these RFID key fob tags?
A: No. These are read-only tags, meaning each fob has a permanently encoded unique ID that cannot be overwritten. This makes them highly secure and tamper-resistant. If you need writable tags, look for T5577 or EM4305-based 125KHz fobs instead.
Q: How durable are these keyfobs for everyday use?
A: Each keyfob is rated for over 100,000 read cycles and operates reliably from -20°C to 85°C. The RF chip is sealed inside an anti-corrosion, high-temperature resistant casing with epoxy resin filling and an ultrasonic weld, making it suitable for heavy daily use in both indoor and outdoor environments.
Q: How many colours are included in the 100-piece pack?
A: The pack includes fobs in 4 different colours, allowing you to colour-code different access levels, departments, or user groups for easy visual management.