LF RFID Key Fob – ABS – EM4200
Price range: $63.00 through $367.00
The EM4200 LF ABS RFID Key-Fob is a compact and rugged contactless tag designed for low-frequency RFID systems operating at 100–150 kHz. Built with a 128-bit ROM, it supports read-only data access and conforms to ISO/IEC 11785 standards.
Encased in waterproof ABS material, the key-fob resists physical wear and environmental stress, making it suitable for both indoor and outdoor applications. It is available in multiple sizes, shapes, and colors to meet different design and branding needs.
Chip Type: EM4200
Operating Frequency: LF 100-150 MHz
Communication Protocol: ISO/IEC 11785
ROM: 128 bits
Compliance: WEEE Directive

Ideal for security access, time attendance, and resident ID systems, the EM4200 key-fob ensures consistent performance in commercial buildings, gated communities, educational institutions, and industrial facilities.
Label Dimensions






Download ‣
What is the EM4200 LF RFID Key-Fob?
The EM4200 LF RFID Key-Fob is a compact, durable identification device designed for secure and efficient access management. As part of the low-frequency RFID family, it operates within 100–150 kHz and is especially effective in environments requiring close-range, interference-free authentication.
Key Features
- Compact and lightweight design
- Waterproof and impact-resistant ABS housing
- Supports ISO/IEC 11785 compliance
- Pre-programmed unique identifier for security
- Multiple color options
- WEEE compliant for sustainable disposal
How Does the EM4200 Key-Fob Work?
This key-fob operates passively, meaning it has no internal power source. When brought into proximity with a compatible RFID reader, its embedded EM4200 chip transmits a unique identifier via electromagnetic coupling. This allows for quick and secure data exchange without physical contact.
Applications and Benefits
- Access Control: Easily integrate with building or facility entry systems
- Time & Attendance: Enables seamless workforce tracking in commercial settings
- Residential Security: Used by property managers for gated communities and smart locks
- Event Identification: Provide secure ID for members or participants
Whether used in commercial or residential contexts, the EM4200 RFID key-fob offers a robust, maintenance-free solution for everyday identification needs.
Learn more info :







