Zinc Alloy Small Door Exit Button With Back Box , No / Com Contact

In this walkthrough, we highlight key design ideas and how they translate to performance. We demonstrate the JS-93D zinc alloy exit button with back box, showing its 2mm structure steel plate, no mechanical bolt, and NO/COM contact. You'll see the sandblast finish, installation on narrow door frames, and how the three-contact output works with different locks. A practical look at a reliable access control solution.