The Milwaukee 14-20-2130 Electronics Assembly W/Ferrite Boar helps manage electrical functions within compatible power equipment during operation. Designed as a replacement electronics assembly, it works with the tool’s electrical system to control and distribute signals between connected components. The ferrite component helps reduce unwanted electrical interference within the assemb... https://www.wholetoolbox.com/milwaukee-14-20-2130-electronics-assembly-w-ferrite-board/14-20-2130.html