https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
RFID Key Fob

RFID Key Fob

GID Technology Inc.
Region: Taiwan
Update: 03/27/2007
Key Specifications
ABS key fob device containing a RFID integrated circuit and antenna

Chip Type:

;Atmel series, EM series, Hitag series, I-code series, Mifare series

Electrical:

;LF operating frequency: 125kHz* ∮ 6kHz

;HF operating frequency: 13.56MHz Reader Standard (ISO/IEC 15693, ISO/IEC 14443)

Temperature:

;Storage: -25C to +75C

;Operating: -25C to +75C

Material:

;ABS plastic injection housing, copper wire antenna and module

;Enclosure rating: IP67

Options:

;6 different colours: blue, black, white, green, yellow, red

;Metal key ring, code printing, 1 or 2 side logo printing

Packaging:

;Delivered in bubble pack tube and packed in a box

Type Number:

;KF-XX (Keyfob, XX denotes IC)

;KFR-XX (Keyfob with ring, XX denotes IC)

*frequency adjustment 100kHz~150kHz

https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions