This is a Diamond Hotend upgrade for your Creality CR-10 family of 3D printers or compatible.
The family is currently CR-10, CR-10S, CR-10 S4, CR-10 S5.
The kit is only for the Creality V2.1 mainboard. Please check your board, before ordering. Or else you need to replace the mainboard.
The upgrade will replace your single hotend with a Diamond Hotend with a 3in/1out nozzle. The Diamond Hotend will make it possible to mix multiple colors from eg. Cyan, Yellow and Magenta, or you could mix different kinds of filament. You can eg. have support material in one input and still print with dual mixing colors.
Here's a link for the Creality CR-10 Diamond Build Guide
Here's a link to determine which CR-10 you have: Creality CR-10 and CR-10S models