Mechanical mods are unregulated mods that have no wiring or circuit boards. The firing pin allows the current from the battery to reach the coil, heat it up and produce vapour. PLEASE NOTE, YOU MUST HAVE AN UNDERSTANDING OF MECHANICAL MODS AND BATTERY SAFETY. ONLY RECOMMENDED FOR ADVANCED USERS AND DRAGON VAPOUR ACCEPTS NO RESPONSIBILITY FOR ANY DAMAGE OR HARM CAUSED BY MISUSE OR MISUNDERSTANDING OF MECH MODS. If you are a first time user of mechanical mods, please ensure you understand the law of ohms and research mech mod safety thoroughly.