RFID 125kHz Key Fob (TK4100/EM4100 Chip) – Read-Only, Non-Writable

Product Overview

The ASIALI RFID ID No.3 Keyfob is a secure and reliable 125kHz contactless access control tag designed for everyday use in residential, commercial, and industrial security systems. Built with TK4100 / EM4100 compatible chip technology, this read-only RFID keyfob comes with a unique pre-programmed ID number that cannot be copied, rewritten, or modified, ensuring a higher level of security for access management. Compact, lightweight, and easy to carry, it is ideal for condominiums, hotels, office buildings, parking systems, and a wide range of access control applications.

Key Features

• Integrated Chips: TK4100 / EM4100

• Frequency: 125kHz

• Read-Only RFID keyfob with factory-programmed unique ID number

• Non-rewritable and non-editable card number for enhanced security

• Compatible with 125kHz RFID access control and attendance systems

• Data modulation: Amplitude Load Modulation

• Data encoding: BPSK for stable signal transmission and anti-interference performance

• Data transfer rate: 3.9 kbps

• 64-bit data storage with manufacturer code and unique identification code

• EEPROM data retention for over 10 years

• Lightweight, durable, and easy to carry on keychains or lanyards

• Available in multiple colors: Red, Yellow, Blue, Black, Gray, Purple, Orange, Pink, Green, and Dark Green

How to Use

Register the RFID keyfob ID number into your access control system or card reader software.

Assign access permissions to the user according to your system settings.

Present the keyfob near a compatible 125kHz RFID reader.

The reader detects the unique ID number and verifies authorization.

Access is granted if the ID has been registered in the system.

Applications

• Condominium and apartment access control

• Hotel room and facility access management

• Office building entry systems

• Parking gate and vehicle access systems

• Employee attendance and time tracking systems

• Warehouse and factory security management

• Gym, club, and membership access systems

• School and campus access control

• General RFID identification and security systems

FAQ

Q: What chip does this keyfob use?

A: This keyfob uses TK4100 / EM4100 compatible chip technology for 125kHz RFID applications.

Q: Can this RFID keyfob be copied or rewritten?

A: No. This is a read-only RFID keyfob with a factory-programmed unique ID number that cannot be rewritten or modified.

Q: What frequency does this keyfob operate on?

A: It operates at 125kHz and is compatible with most standard 125kHz RFID access control systems.

Q: Is the ID number unique?

A: Yes. Each keyfob comes with a unique ID number for secure identification and access management.

Q: What systems is it compatible with?

A: It is suitable for most 125kHz RFID access control, attendance, parking, and identification systems that support TK4100 / EM4100 ID format.

Q: How long can the data be retained?

A: The EEPROM memory provides data retention for more than 10 years under normal operating conditions.

Q: Is the keyfob available in different colors?

A: Yes. It is available in Red, Yellow, Blue, Black, Gray, Purple, Orange, Pink, Green, and Dark Green.

Product Description

The ASIALI RFID ID No.3 Keyfob is a high-security 125kHz RFID proximity tag designed for reliable and convenient access control. Equipped with TK4100 / EM4100 compatible read-only chip technology, each keyfob is programmed with a unique serial number that cannot be duplicated, altered, or rewritten, making it an excellent choice for secure identification and entry management. Using amplitude load modulation and BPSK data encoding, it delivers stable signal transmission, anti-interference performance, and consistent reading capability. With 64-bit data storage, long-lasting EEPROM memory retention of over 10 years, and a durable compact housing, this RFID keyfob is ideal for condominiums, hotels, office buildings, parking systems, and other access control environments requiring dependable and tamper-resistant identification.

Technical Specifications

Product Type: RFID ID No.3 Keyfob

Integrated Chips: TK4100 / EM4100

Frequency: 125kHz

Chip Type: Read-Only

Data Capacity: 64 Bit

Modulation Mode: Amplitude Load Modulation

Data Encoding: BPSK

Data Transfer Rate: 3.9 kbps

Memory Type: EEPROM

Data Retention: More than 10 Years

ID Number: Unique Factory-Programmed Serial Number

Writable: No

Rewrite Support: No

Available Colors: Red, Yellow, Blue, Black, Gray, Purple, Orange, Pink, Green, Dark Green

Application Type: Access Control / Identification / Attendance / Parking

Packaging & Shipping

Product Name: RFID ID No.3 Read-Only Keyfob

Chip Type: TK4100 / EM4100

Frequency: 125kHz

Packaging: Individual Poly Bag or Bulk Packaging

Custom Logo Printing: Available

Custom Number Printing: Available

Color Options: Multiple Colors Available

OEM/ODM Service: Supported

Sample Availability: Available

Production Lead Time: Depends on Order Quantity

Export Standard: International Export Packaging