# SLZB-Ultima

# Installing add-ons on SLZB-Ultima

### Importantly

<p class="callout warning">**Please follow the placement of add-ons in these photos carefully. An incorrectly installed add-on may damage your device!**</p>

### Microphone addon

[![image.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/scaled-1680-/J55image.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/J55image.png)

### Z-Wave, POE, 4G/LTE

[![image.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/scaled-1680-/pAUimage.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/pAUimage.png)

[![image.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/scaled-1680-/x9Dimage.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/x9Dimage.png)

# Opening the case

## How to open device

Video guide [https://youtu.be/gYNhB0CZMaU?t=246](https://youtu.be/gYNhB0CZMaU?t=246)

## Snaps locations

[![image.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/scaled-1680-/pz4image.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/pz4image.png)

[![image.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/scaled-1680-/EsCimage.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/EsCimage.png)

[![image.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/scaled-1680-/Dvnimage.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/Dvnimage.png)

[![image.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/scaled-1680-/EbFimage.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-01/EbFimage.png)

# Buttons and LEDs functions

[![image_2026-07-14_23-52-01.png](https://smlight.tech/support/manuals/uploads/images/gallery/2026-07/scaled-1680-/image-2026-07-14-23-52-01.png)](https://smlight.tech/support/manuals/uploads/images/gallery/2026-07/image-2026-07-14-23-52-01.png)

USB/LAN mode button switches the device from LAN to USB mode and vice versa.  
This button is also used to force the device into USB firmware update mode, you need to hold it down and connect the device to USB while keeping it pressed.