The Cherry Bomber is a relatively old design with a hot positive connection (always on) and a negative frame/case with a copper touch switch which completes the circuit between the Hot positive 510 and the negative side of the 510 connected to the case/frame. The downside is that your atomizer cannot touch the case/frame because it will bypass the switch and complete the circuit and fire the coil. This mod isn't for vapers who haven't a clue about basic electrical theory.