It's a pretty simple flash kit, which was manufactured for the Emisar D4V2, which has flashing pads built into the driver board (the drive board doesn't have to be removed for flashing). There is some companion software to install on your desktop computer and/or phone, for it to work. The instructions for using this are on BLF (budgetlightforum.com). Look for the thread "Emisar D4V2 Flash Kit Instructions".