DoorBird 125 KHz Transponder Key Fob - Qty 10

125 KHz RFID Key Fob Set for DoorBird IP Access Devices

The DoorBird 125 KHz Transponder Key Fob Set (P/N 423860605) provides secure and convenient RFID access control for DoorBird A1121 IP Access Control Devices and D21x IP Video Door Stations. Each fob is equipped with a write-protected TK4100 chip operating at 125 KHz and housed in a durable waterproof ABS shell. Designed for long-term reliability, these key fobs offer dependable identification for residential, commercial, and multi-tenant installations.

Key Features

• System Compatibility: For DoorBird A1121 and D21x IP Video Door Stations
• Chip Type: TK4100, 64-bit read-only, write-protected
• Operating Frequency: 125 KHz (LF RFID)
• Material: ABS plastic, waterproof (IP67) in grey finish
• Pack Quantity: 10 fobs per set
• Secure Access: Read-only design prevents unauthorized duplication
• Compact Form Factor: Lightweight and comfortable for key rings
• Weather-Resistant: Suitable for indoor or outdoor installations

Technical Specifications

• Chip: TK4100 (EM4100 compatible)
• Memory: 64-bit read-only
• Frequency: 125 KHz
• Operating Distance: 1 – 10 cm (0.4 – 3.9 in), depending on reader and antenna
• Encoding: Write-protected / read-only
• Data Retention: > 10 years
• Material: ABS plastic, waterproof, grey
• Dimensions: 39.9 × 30.9 × 5.3 mm (1.6 × 1.2 × 0.2 in)
• Operating Temperature: –25 °C to +55 °C (–13 °F to +131 °F)
• Quantity: 10 pieces per pack

Conclusion

The DoorBird 125 KHz Transponder Key Fob Set is a durable, secure, and maintenance-free solution for expanding DoorBird access control systems. With its TK4100 chip, waterproof ABS design, and long data retention, this set provides dependable performance for everyday use in multi-tenant and commercial environments.