eXternal Motor ControllerAn Ultimate Powerbox v2, Pocket Powerbox Micro & Advance expansion accessoryThe external motor controller (in short XMC) was designed to expand the focus capabilities of the “[url=https://pegasusastro.com/products/ultimate-powerbox-v2/]Ultimate Powerbox v2[/url]” (supports a 2nd focus controller) and adds focus functionality to the “[url=https://pegasusastro.com//products/pocket-powerbox-advance-gen2/]Pocket Powerbox Advance[/url]” or “[url=https://pegasusastro.com/pocket-powerbox-micro/]Pocket Powerbox Micro[/url]“.