The Atom 21700 Mech Mod is Immortal Modz smallest and lightest mod ever! The Atom is a clip activated device. Yes! This mod will clip to your jeans! The clip is brass with copper contacts and copper battery door. It has a delrin body that makes the device really light in your hand or pocket. The atom locks by unscrewing the battery door half a turn. Laser engraved clip, Atom logo, cnc engraved on top of the mod, and Atom name cnc engraved on the side of the mod. All body's serialized. Chuck big clouds in style!