https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
EM-NH600 Electromagnetic Lock

EM-NH600 Electromagnetic Lock

GIANNI INDUSTRIES INC.
Region: Taiwan
Update: 01/10/2007
Key Specifications
Features:

MOV provides spike and surge protection.

Magnetic bond sensor monitor output.

Bi-color LED indicates lock/unlock status.

Anodized aluminum housing.

Dual voltage 12 or 24 VDC selectable.

Anti-Residual magnetism designed.

Complete mounting hardware included.

New-patented groove housing for easy installation.

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