The Alcosense Zenith Plus has a pull of back cover.
1. Locate the groove at the bottom of the unit:
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/6129672789/original/hxPZm8FyI9MPLSOQHXPLdklpUmMMmm8wvg.png?1625715631)
1. Locate the groove at the bottom of the unit:
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/6129672789/original/hxPZm8FyI9MPLSOQHXPLdklpUmMMmm8wvg.png?1625715631)
3. If there appears to be force holding the cover down, wiggle it from side to side to loosen it
4. Then lift the cover completely using a little force.
This should not snap or damage the cover if done right.