https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
Access Control Card RFID EM, Mifare Key Tag or HID Key Fob

Access Control Card RFID EM, Mifare Key Tag or HID Key Fob

Shenzhen YeTong Technology Co.,ltd
Region: China
Update: 05/11/2015
Key Specifications
Meterial: ABS

Dimension: 37×30.3×8.2mm

Frequency: 125khz/13.56mhz

Standard color: blue/grey,other color need customization.

Packaging: glued

Temperature. -25 ~ + 50 degree

IC available at 125KHz nominal

TK4100, EM4100, EM4102, EM4450,

NXP Hiatg1, Hitag2, HitagS256, HitagS2048,

Atmel temic 5567

IC available at 13.56MHz nominal

NXP Mifare1 S50, Mifare1 S70, Desfire MF3ICD41, Mifare Ultralight, Icode1, Icode Sli , Legic mim256, JWL872, TI256, TI2048,INSIDE picopass 2KS

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