# General information

<table border="1" id="bkmrk-download-technical-s" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"></col><col style="width: 50%;"></col></colgroup><tbody><tr><td>Download technical specification</td><td>[Technical Specification](https://www.atreyo.in/sites/default/files/a-downloads/AMB-4I-4O%20Technical%20Specification.pdf)</td></tr></tbody></table>

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#### Connection information  


Below is a description of the expander connectors. The outputs of the expander are directly connected to the relay leads. The relays are of normal open type.

![AMB-4I-4O connectors.png](https://docs.atreyo.in/uploads/images/gallery/2025-03/scaled-1680-/amb-4i-4o-connectors.png)