The Fuhattan Mechanical Mod is a heavy and solid tube with thick copper walls to ensure a very low voltage drop. There is no locking feature on this mod, but the button includes a strong rare earth magnet to keep the mod from turning on by itself. Note: Batteries, Chargers and Oil Cartridges/Tanks must be purchased separately. Mechanical MODs are an Advanced User Product and should not be used by anyone without the proper knowledge on your Battery's Amp Limit and how to test your Atomizer's resistance. Please note that we do not offer any warranty or exchanges on any MODs due to the nature of this product. DOA warranty only.