The difference between LT-V9 and LT-V7.

 1- Structure difference:LT-V9 cartridge is composed of two parts,LT-V7 cartridge is complete of four parts.

 2- Cartridge difference:LT-V9 cartridge which contains nicotine liquid and atomizer is one-time items. So the atomizer of LT-V9 cartridge is one-time items.LT-V7 atomizer can be used repeatedly.LT-V7 nicotine liquid container is one-time items.

 3- The life of LT-V9 is longer than LT-V7 life.LT-V9 is more convenient, no harm to environment.