The new GGreg20_V3 board is supplied in black color. This is probably already the tenth generation, which received an updated circuit for smoother high voltage regulation and limitation of its values. The module also received two stickers: Q.C. and VOID. Read about all this in this article.

Read more:

https://iot-devices.com.ua/en/new-black-ggreg20_v3-board-hv-adjustment-upgrade-and-stickers/