This is a 8 key Macro pad Designed around fitting 8 Mechanical keyboard switches and a micro controller like a Pi Pico. 

This is the micro controller I used, its just a knock off pi pico.

https://www.aliexpress.com/item/1005006051120831.html?spm=a2g0o.order_list.order_list_main.43.52471802Wvy4Kh