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

RFID e-UNITS

GID Technology Inc.
Region: Taiwan
Update: 03/27/2007
Key Specifications
RFID chip and coil antenna for embedding into your product

EU = bare module coil

EUP = with paper backing on both sides,

Mechanical dimensions EU:

;Diameter: 10 ~ 30mm ∮ 0.5 mm

;Thickness: 1.2 mm ~ 4mm ∮ 0.3mm (125 kHz)

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 EU:

;Storage: -25C to +75C

;Operating: -25C to +65C

Material:

;Copper wire antenna and module

Options:

;Code printing for SGSD products

Packaging:

;Delivered in tray packing in carton

Type Numbers:

;EU-XX (E-unit, XX denotes IC)

;EUP-XX (E-unit with paper backing, XX denotes IC)

*frequency adjustment 100kHz~150kHz

Note: E-units should not be assembled in products that are sealed using ultrasonic welding.

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