It very often that after purchasing 3D printer (especially in Anet A8, A6, A2) motherboard is all load to heat up Printing Hotbed. That creates fire hazard problems as connectors are not suitable for that high loads. Hence that issue MOSFET Module is solving existing problems by taking the load off the motherboard. It also solving print quality issues as motherboard is not heavily overloaded with power consumption of heating printbed. It is used not for hotbed only. It is very common that it is used for extruder's heating elements too. MAinly it is to take the load off the motherboard and make motherboard more stable and power interference free. Color: Black Material: plastic If your total power usage is 240W and you have 12V power supply, then it means at least 20A is needed (20X12=240W). As controller board is only capable of 15A this setting will not work. To work, you need this extra power module. This module can be used in both Chitu motherboard, and other open 3D Printer motherboards. This module under normal cooling is found stable work situation at I (Max) = 25A, the using current should not exceed 25A. If you intend to use heated bed with your 3D printer that uses a 12V power supply, then this module is recommended, else it may cause excessive current during which may burn the connectors on the controller board. Anet A8,A6,A2 Compatible. Package Contents: 1 x MOSFET expansion module Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.