I'm not the builder so I don't know, but I'm guessing it has a FET in it, it'd almost have to because it has a tactile dome switch like a Hana and those cant handle any amount of current....regardless I sent a message to the builder and will let you know as soon as I know. It's very clean inside with the cover around the sled, however it doesn't seem to be removable and I don't want to tear anything up. I apologize!