O-STD seems to occur on many hikvision products, however, I noticed that
https://www.hikvision.com/en/products/Mobile-Products/Portable-Products/Body-Camera-Series/ds-mh2311-32g-gle-c--o-std-/
At the bottom there, it says "DS-MH2311/32G/GLE(C)(India-STD)"
Could this have something to do with...