It's just a poorly designed piece of plastic. It does not hold the camera properly or stably to the eyepiece. iPhone 12p doesn't work with it on purpose, you can tweak it, but after a few tricks failed, the screen just goes black.
CISNO USB Digital Microscope: 2MP, 1000X Magnification, 8 LED, Windows-Compatible
25 Review
π Nikon ACULON A211 8x42 Binoculars: High Quality Optics for Exceptional Viewing
15 Review
Discover The Wonders Of The Universe With Orion StarBlast 4.5 Telescope In Teal Color
14 Review
Explore The Night Skies With The Orion SkyQuest XT8 Classic Dobsonian Telescope
12 Review